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• 13:53

### Math Antics - Number Patterns

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• 22:55

### The Golden Ratio: Is It Myth or Math?

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Were on PATREON! Join the community https://www.patreon.com/itsokaytobesmartSUBSCRIBE so you dont miss a video! http://bit.ly/iotbs_sub More info and sources below The golden ratio. Some say its the most mythical number in the universe. Others say it unde

• 12:19

### Lattice Multiplication

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This math video tutorial provides a basic introduction into lattice multiplication - another way of multiplying two numbers! Subscribe: https://www.youtube.com/channel/UCEWpbFLzoYGPfuWUMFPSaoA?sub_confirmation=1 Access to Premium Videos: https://www.patre

• 30:22

### Basic Math For Everyday Life

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This math video tutorial explains how to perform simple addition, subtraction, multiplication, and long division. Here is a list of topics:My Website: https://www.video-tutor.netPatreon: https://www.patreon.com/MathScienceTutorAmazon Store: https://www.am

• 43:12

### Acids and Bases Chemistry - Basic Introduction

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This chemistry video tutorial provides a basic introduction into acids and bases. It explains how to identify acids and bases in addition to how they react with water. It discusses how to identify the conjugate acid and conjugate base of molecules. Finall

• 09:47

### A Math Card Trick I Learned in Finland

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Thanks to Marjut Salminen from fbsoc.fi for her kind permission to tell this story and reproduce the trick here! For more information about MathsJam: mathsjam.com Also: YouTube appears to have cut off the last 10 seconds of my video! Here's what happened

• 05:19

### Teen Cheats Off Of Nerd's Math Test, Ending Is Shocking | Dhar Mann

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If you cheat, youll never get ahead. Hey #DharMannFam, thanks for watching my video! For exclusive giveaways & more inspirational content follow me on Instagram here: http://bit.ly/2Kcbgs2Also, EXCITING NEWS! Shop my latest limited edition merch collectio

• 16:24

### The most important unsolved problem in all of math. The Riemann Hypothesis.

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The Riemann hypothesis is the most notorious unsolved problem in all of mathematics. Ever since it was first proposed by Bernhard Riemann in 1859, the conjecture has maintained the status of the "Holy Grail" of mathematics. In fact, the person who solves

• 13:46

### Algebra Basics: Laws Of Exponents - Math Antics

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This is a re-upload to correct a minor math typo.Learn More at mathantics.comVisit http://www.mathantics.com for more Free math videos and additional subscription based content!

• 12:51

### Math Antics - Calculating Percent Change

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• 14:44

### Newton's quarantine notes that changed math forever

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Documents shown:October 1666 Tract on Fluxions (Original) [Starts page 93/190. Demonstration on page 100]: https://cudl.lib.cam.ac.uk/view/MS-ADD-03958/93October 1666 Tract on Fluxions (Translated): http://www.newtonproject.ox.ac.uk/view/texts/normalized/

• 23:37

### Storytime Science for Kids: Math with Vivian Altmann

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Join us for Storytime Sciencea storybook read aloud followed by a simple related activity geared toward very young children. This month, what if four hungry friends have only three cookies? Math can solve the problem and save the day! Join the Exploratori

• 12:02

### Trig Review for Physics - Common Math Tools - Physics 101, AP Physics 1 Review with Physics Girl

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Creator/Host/Writer: Dianna CowernProducer: Laura ChernikoffHead Writer: Jeff BrockResearcher/Writer: Sophia ChenEditor: Levi ButnerExercises in this video: Problem 1: 1. You are running north-east at a speed of 4 m/s. What component of your velocity is n

• 14:31

### Math Antics - Telling Time

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• 14:23

### 28 Cool Math Tricks To Make Your School Life Easier

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SIMPLE HACKS TO IMPROVE AT MATHIf we ask you what your favorite subject in school is, you probably wont say Math, and thats alright. Some people are just better at other things, however, today well show you that math can actually be easy if you know the c

• 03:10

### DIY Hand Math Numbers Multiplication

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How to do hand and finger numbers multiplication. This maths trick uses your hands to help with more complicated multiplication of single digit number times tables. For more complex multiplications, use this technique:https://www.youtube.com/watch?v=VJf8X

• 10:57

### Math Antics - Measuring Distance

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Fortunately we had filmed this episode before the COVID-19 lockdowns. It's taken us a while to do the editing, but we hope you all like it!Learn More at mathantics.comVisit http://www.mathantics.com for more Free math videos and additional subscription ba

• 02:43

### The Order of Operations Song (PEMDAS) | Silly School Songs

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Learn the Order of Operations (including an important note about PEMDAS) with this fun, funky and very catchy tune. For more information and music, visit http://sillyschoolsongs.com. Lyrics:Parenthesis, ExponentsMultiply or Divide, Add or SubtractParenthe

• 02:03

### The Adding by 2 Song (Math Facts) - Addition Song for Kids | Silly School Songs

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Learning to add by 2 is easy when you add this fun and catchy rhythm! For more music and information, visit http://sillyschoolsongs.comLyrics:Come on, let's add by 2Come on, let's add by 2This is something you can totally doCome on y'all, let's add by 2!2

• 02:22

### The Adding by 3 Song (Math Facts) - Addition Song for Kids | Silly School Songs

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Learn how to add by 3 with this fun and memorable song that will have you tapping your feet! For more music and information, visit http://sillyschoolsongs.com. Lyrics:Alright kids, are you ready to learn how to add by 3?"Yeah!"Well, let's go ahead and do

• 02:07

### The Adding by 1 Song (Math Facts) - Addition Song for Kids | Silly School Songs

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This fun addition song for kids teaches how to add by 1 up to 10, both forwards and backwards. The rhythm supports long-term memory development of the math facts. Enjoy! For more music and information, please visit http://sillyschoolsongs.com. Lyrics:It's

• 04:18

### Tool Tuesday - Pliers

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Introducing Tool Tuesday!Today I cover 4 basic "pliers".Basic PliersNeedle Nose PliersChannel Locks PliersVise Grips Pliers

• 12:01

### Algebra Basics: Slope And Distance - Math Antics

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• 25:31

### How to Start a Fire in the Wilderness | Basic Instincts | WIRED

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Dr. Bill Schindler, a professor of archeology and anthropology at Washington College, demonstrates a couple of the most effective methods for starting a fire in the wilderness with limited resources. "Even though you may never find yourself in a survival

• 07:11

### How to Make Stone Tools in a Survival Situation | Basic Instincts | WIRED

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If you're in the wilderness and have nothing, perhaps the most important thing you need is a sharp, durable edge. Humans are among the weakest species on the planet and tools are what help us compensate for that lack of strength. Dr. Bill Schindler, a pro

• 16:54

### Teacher Delivers Remote Virtual Reality Math Lesson on Angles using Half Life: Alyx

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Review of Angle Vocabulary for Homeschooling Week because I have to teach today, but Half Life Alyx just came out. Want to support my classroom? http://www.donorschoose.org/charlescoomber Twitter – @charlescoomber

• 02:09

### The Grips// Stess-Show Vol1 // Learn basic card grips!

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Stess-Show Vol1 simply teaches the most basic of card deck grips. The Mechanics Grip, Straddle Grip, and Upper Straddle Grip. These grips may seem obvious to some but they are fundamental in learning card moves. This is the best place to begin your card m

• 06:45

195 views / 0 likes - added

Baffled by equations, well no more! Continue learning at this video's sponsor https://brilliant.org/dosLots of people find mathematical equations intimidating because they don't make sense. But they are not hard to understand if you follow a few steps, an

• 03:50

### The Most Beautiful Equation in Math

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Happy Pi Day from Carnegie Mellon University! Professor of mathematical sciences Po-Shen Loh explains why Euler’s Equation is the most beautiful equation in math. The video was filmed as part of a pi and pie discussion with CMU alumna, baker and blo

• 13:13

### 1, 2, 3, 4 Stories About Math

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From geometry to personal finance, there is one common denominator that links the stories in this reelthey are all about math.SUBSCRIBE: https://goo.gl/vR6AcbThis story is a part of our Human Condition series. Come along and let us connect you to some of

• 12:01

### Math Antic - Simplifying Square Roots

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• 02:59

### Tour of the Galaxy | California Academy of Sciences

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Depart Earth’s surface and fly through the solar system to the edge of the Milky Way, discovering objects at increasingly distant locations from Earth. - - - The California Academy of Sciences is a renowned scientific and educational institution ded

• 13:15

### Math Antics - Absolute Value

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• 12:32

### Protecting Privacy with MATH (Collab with the Census)

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This video was made in collaboration with the US Census Bureau and fact-checked by Census Bureau scientists. Any opinions and errors are my own. For more information, visit https://census.gov/about/policies/privacy/statistical_safeguards.html or search "d

• 02:34

### Using Math to Skate On Thin Ice

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People get nervous when they see Mrten Ajne ice skating. He intentionally skates on extremely thin ice. Ajne has pursued this dangerous hobby for 40 years and has skated on more than 1,800 bodies of water from Norway to North America. He uses his knowledg

• 11:28

### Math Antics - Basic Probability

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This is a re-upload to correct some terminology.In the previous version we suggested that the terms odds and probability could be used interchangeably. While this may be okay in casual conversation (since both have to do with the likelihood of an event),

• 06:51

### Math Genius Computes in the Blink of an Eye

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Math Genius Computes in Blink of an Eye from the 20/20 "SuperHumans!" special.

• 13:58

### Ant On A Rubber Rope Paradox

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Watch my newest video, "The Game You Win By Losing (Parrondo's Paradox)": https://youtu.be/PpvboBJEozMPLEASE SUBSCRIBE TO MY PODCAST: https://bit.ly/2BCLhoKCuriosity Box: https://www.curiositybox.com/*********** LINKS *************The Create Unknown Podca

• 12:25

### Five Creative Approaches to Math and Science

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Were introducing you to some brilliant minds working origami, kites, rapping and a web-slinging superhero into the study of math and science in this reel. Plus, were touring an ultra-modern concert hall where music and science come together in the most ac

• 10:15

### The Pillowcase of Terror | Math Magic

362 views / 0 likes - added

LINKS:More about the trick: https://www.riddleministry.com/riddles/cards-in-the-dark/1333/Mismag822's tutorial and demonstration: https://www.youtube.com/watch?v=VaNCbEduGm0Subscribe to quarterly deliveries of my favorite science+math toys: https://www.cu

• 14:28

### Math Antics - Scientific Notation

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• 10:58

### Math in the Simpsons: Apu's paradox

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Apu attends a math lecture at MIT which features an amazing calculation. Apu does not get it and neither did 99.99% of the people watching the episode. In this video the Mathologer tells you everything nobody ever wanted to know about this mystery blackbo

• 08:41

### Math in the Simpsons: Homer's theorem

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After putting on some glasses he found in a toilet Homer feels very smart and declares: "The sum of the square root of any two sides of an iscosceles triangle is equal to the square root of the remaining side." Well, sounds like Pythagoras theorem but it'

• 02:46

### A Basic Explanation on Why (Almost) All Tortoiseshell Cats Are Female - with Walter Bodmer

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Tortoiseshell cats almost all female because the genes coding for fur colour are on the X chromosomes - the black fur gene on one and the orange one on the other. In each cell, only one X chromosome is activated, giving a patchwork pattern. Subscribe for

• 13:59 Popular

### Blippi Visits an Ice Cream Truck | Math and Simple Addition for Children

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Blippi visits an ice cream truck and learns numbers for children. Learn math and simple addition with ice cream bars and snacks with Blippi. See inside the ice cream truck with Blippi in his educational videos for children. This Blippi video has a Blippi

• 11:09

### Math Antics - Exponents and Square Roots

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• 12:05

### Twin paradox: the real explanation (no math)

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The Twin Paradox is the most famous of all of the seeming-inconsistencies of special relativity. In this video, Fermilab’s Dr. Don Lincoln explains it without using mathematics. This is a companion video for his earlier one in which the same question was

• 03:40

### Can Math Save You from Quicksand? | NUMBER CRUSHERS

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Can Math Save You from Quicksand? Can you think on your feet fast enough to solve this math puzzler? Will Jon wake up before the Zombie strikes? Will Gary sink into quicksand before his friend can save him? Take a guess or do the math to know what happens

• 02:36

### Sesame Street: Chaka Khan Sings about Faces with Elmo and Telly

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• 13:56

### Math Antics - Units of Distance

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• 03:33

### 50 People Try to Make Scrambled Eggs | Basic Skills Challenge | Epicurious

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Even people who can't cook can make scrambled eggs, right? Sure. But here we're going to show you how to make them delicious. Like the knives you see in this video? Grab your own set at Bed, Bath, and Beyond - https://www.bedbathandbeyond.com/store/brand/

• 03:59

### 50 People Try to Toss Pizza Dough | Epicurious

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Ok, maybe this is one of the more complicated "basic skills" we've made our 50 people try, but who could resist? Watch as 50 people attempt to kneed, roll and toss pizza dough. Want to learn this and other Basic Skills? Check out our new cookbook, on sale

• 02:53

### Travel Deep Inside a Leaf | California Academy of Sciences

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Take a journey inside a leaf of a redwood tree. Enter the stoma and view photosynthesis on a molecular level, knowing that the animation prioritizes scientific accuracy. Educators might also be interested in an annotated version of this video: https://you

• 01:53

### How to Divide Fractions

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Watch more Basic Math Skills videos: http://www.howcast.com/videos/262765-How-to-Divide-Fractions Math can be scary, but don't give up. Follow these simple steps, and soon you'll be dividing fractions like a pro. Step 1: Write the problem Write out the fi

• 14:07

### 10 MATH TRICKS THAT WILL EMBARRASS YOUR TEACHER

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INCREDIBLY COOL MATH TRICKS FOR KIDS This video is dedicated to all those people who think that math was boring. Today, we are here to prove the opposite! In this video, we collected the coolest math tricks for all ages. It doesn't matter if you're 6 or 6

• 20:59

### Ancient Rome in 20 minutes

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Caesar, The Colosseum, Republic, Nero, geese, plebeians, legions — everything that you once knew, but forgot, in a crash course video by Arzamas. Narrated by Brian Cox. "Ancient Rome in 20 minutes" is an English version of a Russian video by Arzamas

• 17:38

### Ancient Greece in 18 minutes

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Homer, The Minotaur, 300 spartans, Greek theatre, Parthenon, democracy — everything that you once knew, but forgot, in a crash course video by Arzamas. Narrated by Brian Cox. "Ancient Greece in 18 minutes" is an English version of a Russian video by

• 16:34

### 18 EASY WAYS TO TEACH MATH TO CHILDREN

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TEACHING BASIC MATH TO KIDS We know many ways to keep toddlers entertained. Today we are here to prove that math can be fun! It's important not only to keep them happy and excited but also to educate and develop them. There are many basic skills to train

• 14:48

### 28 SIMPLE STUDY TRICKS THAT WILL COMPLETELY CHANGE YOUR LIFE

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FANTASTIC STUDY HACKS AND IDEAS School can be real fun, especially if you just learn a couple of our awesome ideas and life hacks. I promise, our amazing school crafts can help to make your studies even brighter and smarter. You'll learn how to cope with

• 11:40

### Voltage, Current, Electricity, Magnetism

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Easy to understand animation explaining all basic concepts.

• 08:23

### Polynomial derivatives: 3D visualization

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How to visualize the derivatives of polynomials.

• 11:53

### Top 15 RICHEST People In History

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Here are the top 15 richest people to ever live. These billionaires and trillionaires put people like Bill Gates and Jeff Bezos to shame! Like us on Facebook: https://www.facebook.com/TopTrending Follow us on Twitter: https://twitter.com/TopTrending Comme

• 07:11

### Immune System: Innate and Adaptive Immunity Explained

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Our immune system is a fascinating entity, that functions in quite a unique and efficient manner. Comprising of various types of cells, it is prepared for any kind of breach in the fortress of our body, and is equipped to fight off a staggering number of

• 08:02

### How Pakistan's cricket superstar became prime minister

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Why the world is watching Imran Khan. Subscribe to our channel! http://goo.gl/0bsAjO Imran Khan was sworn in as Pakistan’s new prime minister on August 18, but he is no ordinary politician. Before rising to power, he was a dashing cricket superstar. He le

• 02:09

### What is a fractal? A lens to infinity

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A fractal pattern is a kind of equation occurring all around us in nature. So what's a fractal and what does it have to do with nautiluses, romanesco broccoli, Star Trek II: The Wrath of Khan, peacocks, and predicting diseases? SUBSCRIBE! for more Popular

• 08:51

### The Viral Balloon Puzzle - The REAL Answer Explained (Using Ph.D. Level Math)

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They say only geniuses can solve this puzzle, and this time they are correct. Thanks to all patrons! Special thanks to: Shrihari Puranik Yildiz Kabaran Kyle My blog post for this video https://wp.me/p6aMk-82U Sources https://puzzling.stackexchange.com/que

• 01:42

### How To Use Rounding in Math Problems

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How To Use Rounding in Math Problems. Part of the series: Math Problems. In certain math problems rounding may actually make finding a solution easier and more clear. Use rounding in math problems with help from a mathematics educator in this free video c

• 02:41

### How to Substitute Known or Given Values for the Variables in an Algebraic Expression

546 views / 0 likes - added

Substituting known or given values for a variable is required to complete some types of operations. Learn how to substitute known or given values for a variable with help from a mathematics tutor and educator in this free video clip.

• 10:51 Popular

### Math Antics - Intro to the Metric System

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• 02:33

### The Man Behind Khanacademy - Salman Amin Khan

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The story of Salman Amin Khan. The faculty of Khanacademy!

• 02:18

### DIY | Burrito Math | Cartoon Network

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Jack dreams of making the mathematically perfect burrito but when he tries to do it the easy way, using his sassy robo pal Mitchell, everything gets really gross. Earn the Mathematician patch from DIY.org! https://diy.org/skills/mathematician From DIY.org

• 02:43

### The Man Teaching Math Lessons in the Sky

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Winfred Randolph Lowe, aka, “Randy the Kite Man,” is a retired math teacher taking geometry to new heights. For the past 20 years, Winfred has spent his free time flying kites. Now he’s combining his two favorite pastimes to teach the fundamentals of geom

• 07:18

### 9 SPEEDY MATH TRICKS FOR SCHOOL

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If you have issues with math, it’s not really your fault. The problem is that nobody taught you the most useful math tricks in school. But here they are! No calculators, just your hands and some simple tricks - watch and learn! ---------------------------

• 11:11 Popular

### THAT IS HOW YOU CAN CONFUSE YOUR MATH TEACHER AT SCHOOL

780 views / 1 likes - added

Learn how to draw prospective without a ruler, measure angles and figure out how many days there are in any given month with your hand! These and many others mind-blowing Math tricks are in this video! There are some GREAT tricks for young mathematicians!

• 01:51

### How Captain America's Shield Follows Basic Physics

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Captain America's shield follows the law of elastic collisions. This means that whenever the shield hits an object, its speed does not change. It would be impossible for the average human to control a shield like this, but because Captain America is a sup

• 13:25

### 19 BRAIN TEASERS THAT WILL INCREASE YOUR IQ LEVEL

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These 19 cool brain teasers and optical illusion will help you increase your IQ one level up: 00:14 - Mystery riddle to test your ability to think in dangerous situation. 01:23 - Logic test - Math riddle. An easy riddle to test your perception and even ma

• 13:55 Popular

### 18 MATH RIDDLES THAT EVEN YOUR MATH TEACHER WILL FAIL

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A great chance to challenge your math teacher! These 18 math riddles will trick and will make sweat even your math teacher: 00:14 - Easy riddle to warm you up for the main brain workout. Kids solve this in seconds! 00:46 - Riddle to test your ability to t

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• 14:31

### BEST Guess Who Strategy- 96% WIN record using MATH

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Here is a strategy for winning 96% of your competitive Guess Who games. Now all you need is a time machine to return to 1991 and CRUSH Jeff Lee in the 5th grade Guess Who Championships. FREE trial for Lynda.com- http://bit.ly/LyndaMarkRober MUSIC- 0:21- M

• 17:32

### The Math (and money) of Soccer Stickers - Numberphile

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Check out Brilliant (and get 20% off) by clicking https://brilliant.org/numberphile Featuring Federico Ardila --- More links & stuff in full description below ↓↓↓ Extra footage (the 'beautiful math' bit): https://youtu.be/iMSitUaoS3I Extra footage (some f

• 04:51

### Why can't you divide by zero? - TED-Ed

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Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/why-can-t-you-divide-by-zero In the world of math, many strange results are possible when we change the rules. But there’s one rule that most of us have

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• 13:54 Popular

### 16 Math Riddles And Logic Puzzles That Will Crack Your Mind Wide Open

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These math riddles and logic puzzles will either crack your mind wide open or will boost your IQ! (Hopefully, the latter) 00:14 - Just a nice warm-up before the main brain workout! To crack this easy riddle you need to pay attention to every item on the t

• 13:17

### Probability that at least 2 people in a room of 30 share the same birthday | Probability and Statist

407 views / 0 likes - added

The probability that at least 2 people in a room of 30 share the same birthday. Practice this lesson yourself on KhanAcademy.org right now: https://www.khanacademy.org/math/probability/probability-and-combinatorics-topic/probability_combinatorics/e/probab

• 04:34

### OK Go Sandbox - One Moment of Math

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Damian Kulash, lead singer of OK Go, discusses the immense amount of math behind their video,”The One Moment”. This video is part of www.OKGoSandbox.org

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• 08:00

### 15 BRILLIANT MATH TRICKS THEY DON'T TEACH YOU AT SCHOOL

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Too bad they don't teach you this at school! But I always got you! So check out these genius Math tricks and have fun! ;) ---------------------------------------------------------------------------------------- 5-Minute Crafts: https://www.goo.gl/8JVmuC F

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• 09:13

### Math Antics - Subtracting Mixed Numbers

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• 03:12

### Science Artist Uses Math to Make Sculptures

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John Muntean has been creating magic angle sculptures since 1986. At first, the sculpture just looks like an abstract piece. When rotated at the magic angle and lit from above, a three-part masterpiece emerges. See more from John Muntean: https://www.jvmu

• 04:11

### The Order of Operations is Wrong

280 views / 0 likes - added

Morally Wrong, that is... MinutePhysics is on Google+ - http://bit.ly/qzEwc6 And facebook - http://facebook.com/minutephysics And twitter - @minutephysics Minute Physics provides an energetic and entertaining view of old and new problems in physics -- all

• 15:17

### 35 BASIC KITCHEN TIPS FOR KIDS

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Are you going to have a home party? Surprise all your friends with super yummy and tasty-looking ice-cream cupcakes, milkshakes and lolipops! Also find out an easy way to check if your eggs for breakfast are fresh or not! Enjoy! Subscribe to 5-Minute Craf

• 02:13

### Crazy Math Trick: I will guess Your Age! (OLD 2016 version)

492 views / 0 likes - added

Check here for the 2017 version: https://www.youtube.com/watch?v=PQjNF34H3Bs&feature=youtu.be ★★ For more broccolies like this... Subscribe to DB! ★★ I will guess your age! This is a crazy math trick that is likely to impress you and your friends too! You

• 04:01

### Product rule - Calculus derivatives tutorial

334 views / 0 likes - added

Learn how to take the derivative of a function using the product rule. This complete calculus derivatives tutorial explains why and how to use the product rule. To see all my calculus videos check out my website http://MathMeeting.com My name is Chris and

• 04:28

### Product rule - Logarithm derivatives example

315 views / 0 likes - added

Learn calculus with this product rule Derivative example with logarithms and exponential functions. This complete calculus derivatives tutorial explains why and how to use the product rule. To see all my calculus videos check out my website http://MathMee

• 11:09

### 15 GENIUS MATH TRICKS THAT ARE ACTUALLY EASY

557 views / 0 likes - added

How to embarrass your teacher. Smart and simple backs to school math hacks and tricks. Learn how to multiply fast in your head. Subscribe to 5-Minute Crafts KIDS: https://goo.gl/PEuLVt ----------------------------------------------------------------------

• 01:52

### Three Solutions! Can You Find Them? (math trick with answers)

446 views / 0 likes - added

★★ Please LIKE if you found at least ONE solution!! ★★ This is an impossible equation, because 6+4 is clearly not 4... BUT there are three solutions to this equation by moving just ONE matchstick. Can you find all three solutions? I am curious to see how

• 02:13

### Crazy Math Trick: I will guess Your Age! (2017 with answers)

591 views / 4 likes - added

★★ For more broccolies like this... Subscribe to DB! ★★ I will guess your age! This is a crazy math trick that is likely to impress you and your friends too! You start with a RANDOM number and then end up with your Age and that number... pretty incredible

• 09:04

### Math Antics - Adding Mixed Numbers

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• 06:30

### When To Try New Things (According to Math)

305 views / 0 likes - added

The Explore/Exploit Trade Off. The best algorithm for when to try new things and when to stick to what you know: the Gittins Index. Based on a chapter of the book Algorithms to Live By, The Computer Science of Human Decisions by Brian Christian and Tom Gr

• 01:45

546 views / 0 likes - added

In this Flipside Science unit, designed for a middle school audience, we'll explore environmental issues related to energy use and conservation. In our most recent installment, find out how a dairy farm is using a methane digester to turn cow poop into el

• 10:06

### Universal Basic Income Explained – Free Money for Everybody? UBI

355 views / 0 likes - added

What is UBI? How would free money change our lives. Kurzgesagt Newsletter: http://eepurl.com/cRUQxz Support us on Patreon so we can make more videos (and get cool stuff in return): https://www.patreon.com/Kurzgesagt?ty=h Kurzgesagt merch: http://bit.ly/1P

• 06:29

### When To Quit (According to Math)

224 views / 1 likes - added

Optimal Stopping. The Secretary Problem Explained. Taken from a chapter of the book "Algorithms to Live By - The Computer Science of Human Decisions" by Brian Christian and Tom Griffiths Hi! I'm Jade. Subscribe to Up and Atom for new physics, math and com

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### Math Antics - Mixed Numbers

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In this re-make of our Mixed Numbers video, we take a more intuitive approach to converting between Mixed Numbers and Improper Fractions. You can still access the old version of the video here: https://www.youtube.com/watch?v=-55KA6kaXFY

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### Math, When Are You Going To Use It?

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If you're in or went to high school, you're familiar with the phrase "When am I ever going to use this?" when talking about pretty much anything you learn in math class. This is the answer to that question. The real answer, not something like "one day a s

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### Where do math symbols come from? - John David Walters

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Sign up for our newsletter here: https://ed.ted.com/newsletter View full lesson: https://ed.ted.com/lessons/where-do-math-symbols-come-from-john-david-walters Math is full of symbols: lines, dots, arrows, English letters, Greek letters, superscripts, subs

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### Teen Titans Go! | The Titans Academy Awards | Cartoon Network

658 views / 1 likes - added

Robin creates the Teen Titan Awards in an effort to get his teammates to clean up the Tower. CN GAMES: http://bit.ly/CNGames SUBSCRIBE: http://bit.ly/109Y6wq WATCH MORE: http://bit.ly/VgnfHu About Teen Titans GO!: TEEN TITANS GO! is a comedy featuring the

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### Elon Musk's Basic Economics

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Elon Musk, the founder of Tesla and SpaceX has a very insightful view of economics. Animation by Josh Sherrington (https://www.youtube.com/heliosphere) Sound by Graham Haerther (http://www.Haerther.net) Thumbnail by Joe Cieplinski (http://joecieplinski.co

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### Smart Math Techniques - Solve maths problems in seconds

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Topic In this topic our expert trainer Shruti explains how to solve difficult maths problems in a matter of seconds. OBJECTIVE To enable you to to do faster calculation using best speed maths techniques and make you score more in your exams. These speed m

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### Conjugate acid-base pairs | Acids and bases | Chemistry | Khan Academy

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Introduction to conjugate acid-base pairs. Definition and examples of conjugate acid-base pairs. Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivit

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### Le Chatelier's principle: Worked example | Chemical equilibrium | Chemistry | Khan Academy

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A worked example using Le Chatelier's principle to predict how concentrations will shift for different perturbations. Example includes changes in reaction vessel volume, changing amount of solid product, adding inert gas, and adding a catalyst. Chemistry

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### Introduction to reaction quotient Qc | Chemical equilibrium | Chemistry | Khan Academy

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Introduction to the reaction quotient Qc, and how to use the reaction quotient to predict how the reaction concentrations will change. Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its

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### Bond enthalpy and enthalpy of reaction | Chemistry | Khan Academy

339 views / 0 likes - added

Introduction to bond enthalpy, and how to use bond enthalpies to calculate enthalpy of reaction. Watch the next lesson: https://www.khanacademy.org/science/chemistry/thermodynamics-chemistry/enthalpy-chemistry-sal/v/2015-ap-chemistry-free-response-7?utm_s

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### Calculating internal energy and work example | Chemistry | Khan Academy

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Worked example calculating the change in internal energy for a gas using the first law of thermodynamics. Watch the next lesson: https://www.khanacademy.org/science/chemistry/thermodynamics-chemistry/internal-energy-sal/v/specific-heat-and-latent-leat-of-

• 05:53

### Comparing Q vs K example | Chemical equilibrium | Chemistry | Khan Academy

312 views / 0 likes - added

A worked example using reaction quotient Q to predict how concentrations will shift so the reaction can get to equilibrium. Watch the next lesson: https://www.khanacademy.org/science/chemistry/acids-and-bases-topic/acids-and-bases/v/arrhenius-definition-o

• 07:33

### Ways to get a buffer solution | Chemistry | Khan Academy

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Describes the two main situations where you get a buffer: making a buffer for a specific pH by combining a weak acid and a salt containing the conjugate base, and using a neutralization reaction by combining a weak acid and a strong base. Watch the next l

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### Rate constant k from half-life example | Knetics | Chemistry | Khan Academy

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Example problem showing how to find the rate constant k from the half-life of a first order reaction. Watch the next lesson: https://www.khanacademy.org/science/chemistry/chem-kinetics/copy-of-kinetics/v/second-order-reaction-with-calculus?utm_source=YT&u

• 07:50

### pH and pKa relationship for buffers | Chemistry | Khan Academy

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How the Henderson-Hasselbalch equation can be used to look at the ratio of conjugate acid and base using relationship between buffer pH and pKa. Watch the next lesson: https://www.khanacademy.org/science/chemistry/acid-base-equilibrium/buffer-solutions/v/

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### Noble gas configuration

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How to write electron configurations for atoms and monatomic ions using noble gas configuration Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity

• 07:45

### Introduction to chemistry

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A big picture intro to chemistry and why it is fascinating. Chemistry on Khan Academy: Did you know that everything is made out of chemicals? Chemistry is the study of matter: its composition, properties, and reactivity. This material roughly covers a fir

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460 views / 0 likes - added

Need help with SAT reading? Join Eric, one of Khan Academy’s SAT experts, for an SAT reading class. During class, Eric explains a proactive approach to answering reading questions and walks through some of the most common types of questions. This is an ed

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### Khan Academy Live: SAT Writing Class

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Need help with SAT writing? Join Eric, one of Khan Academy’s SAT experts, for an SAT writing class. Eric walks through key grammar concepts like subject-verb agreement and sentence punctuation. This is an edited version of our livestream from March 9, 201

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### Khan Academy Live: AP Calculus

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Taking AP Calculus? Prep for the exam with our free live tutoring session. Dave, one of our calculus experts, will review key concepts, solve sample questions, and share ways to avoid common mistakes. Prep for your AP Calculus exams on Khan Academy: https

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### Khan Academy Live: AP US History

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Taking AP US History? Prep for the AP exam with our free live tutoring session. Kim, our history expert, will share tips and strategies for the exam. Study for AP US History on Khan Academy: https://www.khanacademy.org/humanities/us-history/ap-us-history

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### Khan Academy Live: SAT Math

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Need help with SAT math? Join Eric, one of Khan Academy’s SAT experts, for an SAT math class. Eric reviews some of the most important math skills for the test and provides tips on how to avoid careless mistakes. This is a recording of our May 16 livestrea

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### Khan Academy Live: SAT Writing

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Need help with SAT writing? Join Eric, one of Khan Academy’s SAT experts, for a live SAT writing class Tuesday, May 30 at 7 pm ET/4pm PT. It’s free! Eric will walk through key grammar concepts like subject-verb agreement and sentence punctuation. Can’t ma

• 05:43

### Under- and overstatement | Style | Grammar

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This is, bar none, the greatest video Khan Academy has ever made, although I may be slightly overstating that. Learn how to master this style by following along.

• 05:05

### Parallel structure | Syntax | Khan Academy

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Parallel structure isn’t a set rule, but more of a stylistic choice: it helps sentence elements maintain a pattern. This is a very special episode because it’s Paige’s last video with us as a KA intern! We will miss having Paige as a contributor to the Gr

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### Relative clauses | Syntax | Khan Academy

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A relative pronoun is a word like “that” or “which” or “who”, so a relative clause is a clause that begins with a relative pronoun. In the sentence “The dragon who breathed blue fire has retired,” “who breathed blue fire” is a relative clause. Learn more

• 07:04

### Dependent and independent clauses | Syntax | Khan Academy

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Independent clauses can stand on their own as sentences, but dependent clauses can’t. We’ll take a closer look at what this means. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/syntax/e/dependent-and-independent-clauses Wat

• 05:57

### Phrases and clauses | Syntax | Khan Academy

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A phrase is any collection of words that behaves like a part of speech, like a noun phrase (“my brother Stu”), an adjectival phrase (“in a different shade of blue”), or an adverbial phrase (“with elegance and tact”). A clause is any noun phrase plus a ver

• 04:19

### Dangling modifiers | Syntax | Khan Academy

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A modifying word or phrase “dangles” when it doesn’t apply to the word it’s supposed to modify. Learn how to spot and fix this problem! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/syntax/e/dangling-modifiers/ Watch the ne

• 04:43

### Subject, direct object, and indirect object | Syntax | Khan Academy

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A subject is the noun phrase that drives the action of a sentence; in the sentence “Jake ate cereal,” Jake is the subject. The direct object is the thing that the subject acts upon, so in that last sentence, “cereal” is the direct object; it’s the thing J

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### Subjects and predicates | Syntax | Khan Academy

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A subject is the noun or pronoun-based part of a sentence, and a predicate is the verb-based part that the subject performs. Let’s explore how that works in context. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/syntax/e/id

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### Run-ons and comma splices | Syntax | Khan Academy

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A run-on sentence doesn’t separate any of its independent clauses with the punctuation that it needs, and a comma splice incorrectly separates two independent clauses with a comma, instead of a comma-and-coordinating-conjunction. Practice this yourself on

• 03:48

### Recognizing fragments | Syntax | Khan Academy

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A sentence fragment is a chunk of language that hasn’t made it all the way to being a working sentence; it might be missing a verb, or there might not be a subject. Learn how to turn a fragment into a sentence in this video! Practice this yourself on Khan

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### Pronoun-antecedent agreement | Syntax | Khan Academy

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An antecedent is “the thing that came before”. When you use a pronoun, it’s standing in for a word you used previously—that’s the antecedent. Join us as we demonstrate how to make sure that your pronouns and antecedents match up with one another: that’s c

• 04:53

### Subject-verb agreement | Syntax | Khan Academy

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Agreement is the art of making sure that sentence parts agree with one another; you want to make sure that your subjects and verbs match up. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/syntax/e/subject-verb-agreement Watc

• 04:14

### Compound-complex sentences | Syntax | Khan Academy

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Compound-complex sentences are compound sentences with dependent or subordinate clauses added to them. Paige and Rosie explain how to spot and use them. Practice this yourself on Khan Academy right now www.khanacademy.org/syntax/e/complex-and-compound-com

• 05:07

### Complex sentences | Syntax | Khan Academy

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Complex sentences are simple sentences with dependent or subordinate clauses added to them. Paige and Rosie explain how to spot them and use them in this video. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/syntax/v/compound-comple

• 04:29

### Simple and compound sentences | Syntax | Khan Academy

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A simple sentence contains one independent clause. A compound sentence contains more than one! Put another way: a simple sentence contains a subject and a predicate, but a compound sentence contains more than one subject and more than one predicate. Pract

• 02:50

### Exclamations | Syntax | Khan Academy

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An exclamation is a sentence that expresses great emotion! David and Paige covered declarative, interrogative, and imperative sentences; now they tackle a fourth type of sentence that ends in an exclamation mark. Find out more! Watch the next lesson: http

• 03:32

### Three types of sentence | Syntax | Khan Academy

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Three essential types of sentence are declarative sentences (which are statements), interrogative sentences (which are questions), and imperative sentences (which are orders). Join us as we give examples of each! Practice this yourself on Khan Academy rig

• 04:34

### What is a sentence? | Syntax | Khan Academy

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A sentence is a grammatically complete idea. All sentences have a noun or pronoun component called the subject, and a verb part called the predicate. David and Paige explore this division across several different example sentences. Watch the next lesson:

• 02:54

### BONUS: "FANBOYS," a mnemonic song | Conjunctions | Parts of speech| Khan Academy

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FANBOYS" is a mnemonic device you can use to help remember the coordinating conjunctions of English. Team Grammar made this video, figuring that we couldn't very well cover conjunctions without writing a song, now could we? If you're moved to make your ow

• 05:12

### Ellipses | Punctuation | Khan Academy

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Ellipses are three little dots that we use to show a pause or that a portion of a quote has been removed. Learn how to use them in this video. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/miscellaneous-punctuation/e/introd

• 04:09

### Parentheses | Punctuation | Khan Academy

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Parentheses set off extra information (such as a writer's remarks, an interruption, or a reference) from the rest of a sentence. Learn how to use them in this video! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/miscellaneo

• 04:51

### Hyphens vs. dashes | Punctuation | Khan Academy

341 views / 1 likes - added

Hyphens and dashes look pretty similar, but their uses are very different! Learn when to use each one in this video. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/miscellaneous-punctuation/e/dashes-and-hyphens Watch the nex

• 06:20

### Dashes | Punctuation | Khan Academy

287 views / 0 likes - added

Dashes are like little actors—they can behave like colons, pairs of commas, or parentheses. Learn how to use them in this video! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/miscellaneous-punctuation/e/introduction-to-the-

• 03:13

### Using quotation marks in titles | Punctuation | Khan Academy

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Learn how to use quotation marks to title things like poems, songs, and episodes of TV shows. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/miscellaneous-punctuation/e/italics--underlines--and-quotes/ Watch the next lesson:

• 04:18

### How to use italics and underlines | Punctuation | Khan Academy

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Learn how to use italics and underlines when writing the titles of works or when emphasizing a particular word or phrase. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/miscellaneous-punctuation/e/italics--underlines--and-qu

• 10:57

### BONUS: History of the possessive apostrophe | The Apostrophe | Punctuation | Khan Academy

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David, Paige, and Jake cover the fascinating history of the possessive apostrophe. Stay tuned for this bonus video! Missed the previous lesson? Watch here: https://www.khanacademy.org/humanities/grammar/punctuation/the-apostrophe/v/bonus-history-of-the-ap

• 05:40

### BONUS: History of the apostrophe | The Apostrophe | Punctuation | Khan Academy

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The apostrophe has a bizarre history, including being the name for something that's not really related to grammar at all. David, Paige, and special guest Jake explain. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/punctuation/the-a

• 02:31

### Choosing between its and it’s | The Apostrophe | Punctuation | Khan Academy

292 views / 1 likes - added

David and Paige explain the meaning of two English words that look and sound very similar but act very different: _its_ and _it's_. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-apostrophe

• 02:51

### Apostrophes and plurals | The Apostrophe | Punctuation | Khan Academy

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There is *one* extremely rare case in which we use apostrophes to make things plural. David and Paige, KA's resident grammarians, discuss this unusual case. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/p

• 04:11

### Advanced (plural) possession | The Apostrophe | Punctuation | Khan Academy

335 views / 0 likes - added

Paige and David talk about using apostrophes to show that something belongs to multiple people. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-apostrophe/e/advanved--plural--possesion Watch

• 01:51

### Possession for words ending in “s” | The Apostrophe | Punctuation | Khan Academy

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Do words that end in "s" still need _'s_ to show possession? David and Paige explain! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-apostrophe/e/introduction-to-the-possessive-case Watch the next lesson: https://www.kha

• 03:45

### Introduction to the possessive | The Apostrophe | Punctuation | Khan Academy

364 views / 0 likes - added

Apostrophes can help show when something belongs to someone. Paige and David explain how! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-apostrophe/e/introduction-to-the-possessive-case Watch the next lesson: https://www

• 03:36

### Introduction to contractions | The Apostrophe | Punctuation | Khan Academy

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Apostrophes are great at standing in for missing letters, allowing us to shorten words. Paige and David discuss contractions and the Principle of Least Effort. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-apostrophe/e/

• 04:50

### Introduction to the apostrophe | The Apostrophe | Punctuation | Khan Academy

409 views / 0 likes - added

David and Paige, KA’s resident grammarians, introduce a new piece of punctuation: the apostrophe! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-comma/e/introduction-to-the-apostrophe Watch the next lesson: https://www.k

• 03:43

### BONUS: The Oxford comma | Punctuation | Grammar | Khan Academy

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David and Paige tackle the great comma debate of our time: Oxford comma or no Oxford comma? Missed the previous lesson? https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/v/appositives-the-comma-punctuation-khan-academy?utm_source=YT&utm

• 03:00

### Appositives | Punctuation | Grammar | Khan Academy

332 views / 0 likes - added

David and Paige, KA’s resident grammarians, cover appositives and how to use commas along with them. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/e/appositives?utm_source=YT&utm_med

• 03:00

### Commas in dialogue | Punctuation | Grammar | Khan Academy

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“Today we’re going to talk about using commas in dialogue,” said David and Paige, KA’s resident grammarians. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/e/commas-in-dialogue?utm_so

• 03:24

### More uses for commas | Punctuation | Grammar | Khan Academy

301 views / 0 likes - added

David and Paige, KA’s resident grammarians, discuss tag questions, yes and no statements, and direct address -- all situations where the comma is super useful. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/v/c

• 01:51

### Punctuating a list | Punctuation | Grammar | Khan Academy

343 views / 0 likes - added

Learn how to use commas to punctuate a written list of people, things, actions, or events. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/e/punctuating-lists?utm_source=YT&utm_medium=

• 04:35

### Commas and introductory elements | Punctuation | Grammar | Khan Academy

301 views / 0 likes - added

In English, you use commas to separate introductory elements from the rest of a sentence. Find out how with David and Paige! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/e/commas-an

• 03:19

### Commas in space and time | The Comma | Punctuation | Khan Academy

329 views / 0 likes - added

Learn how to use commas when writing addresses (in space) and dates (in time). Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/e/salutations--valedictions--dates--and-addresses Watch t

• 02:18

### Salutations and valedictions | Punctuation | Grammar | Khan Academy

299 views / 0 likes - added

David and Paige, KA’s resident grammarians, talk about how to address and sign off on letters using commas! Watch the next lesson: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/v/commas-in-space-and-time-the-comma-punctuation-khan-a

• 03:59

### Meet the Comma | Punctuation | Grammar | Khan Academy

357 views / 0 likes - added

David and Paige introduce you to the superhero of the punctuation world: the comma! Practice this yourself on Khan Academy right now: . Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/punctuation/the-comma/

• 02:52

### Three ways to end a sentence | Punctuation | Khan Academy

303 views / 0 likes - added

David and Paige, KA’s resident grammarians, introduce the three ways to end a sentence: the period, the exclamation point, and the question mark. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-comma/e/three-ways-to-end-a

• 06:08

### Beginning sentences with conjunctions | The parts of speech | Grammar | Khan Academy

308 views / 0 likes - added

Is it okay to begin a sentence with a conjunction like "but" or "because"? Yes. David explains why. Missed the previous lesson? https://www.khanacademy.org/humanities/grammar/partsofspeech/conjunctions/v/correlative-conjunctions?utm_source=YT&utm_medium=D

• 03:12

### Correlative conjunctions | The parts of speech | Grammar | Khan Academy

433 views / 0 likes - added

Correlative conjunctions work in pairs to connect parts of sentences. David teaches you how they do it! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/conjunctions/e/correlative-conjuntions?u

• 05:27

### Subordinating conjunctions | The parts of speech | Grammar | Khan Academy

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Subordinating conjunctions join two parts of complex sentences––independent clauses to dependent clauses. David explains how. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/conjunctions/e/coo

• 04:33

### Coordinating conjunctions | The parts of speech | Grammar | Khan Academy

380 views / 0 likes - added

Coordinating conjunctions connect parts of sentences to each other. David explains how. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/conjunctions/e/meet-the-conjunction?utm_source=YT&utm_me

• 03:50

420 views / 1 likes - added

When using more than one adjective, sometimes you put a comma between them and sometimes you don't. Learn how to tell when you need a comma in this video! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/the-modifier/e/commas-

• 09:03

### BONUS VIDEO | Singular They | The parts of speech | Grammar | Khan Academy

296 views / 0 likes - added

You may have been hearing a lot about the "singular they" recently. But what is it? How does it work, what is its history, and is it grammatical? Let's find out. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofspeech/the-modif

• 02:55

### Emphatic pronouns | The parts of speech | Grammar | Khan Academy

292 views / 0 likes - added

Sometimes we use reflexive pronouns like "myself" and "ourselves" for emphasis in a sentence, like, "If you won't help me, then I'll do it myself!" KA's Grammar Fellow, David, explains this usage. Practice this yourself on Khan Academy right now: https://

• 05:03

### Indefinite Pronouns | The parts of speech | Grammar | Khan Academy

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David, Khan Academy's Grammar Fellow, covers three nifty features of indefinite pronouns, which are pronouns that are just a little vague, y'know? Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspee

• 05:18

### Pronoun number | The parts of speech | Grammar | Khan Academy

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The difference between something being singular or plural is what we call 'grammatical number' in English. Here's how that idea applies to pronouns! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofsp

• 04:39

### Grammatical person and pronouns | The parts of speech | Grammar | Khan Academy

299 views / 0 likes - added

There's this idea in grammar called grammatical person that helps describe who's being talked about in a sentence. David, KA's Grammar Fellow, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/parts

• 05:34

### Subject and object pronouns | The parts of speech | Grammar | Khan Academy

295 views / 0 likes - added

Before we get any further with pronouns, let's cover what the difference between a subject and an object pronoun is, because the distinction between those two concepts will start coming up a good deal. Practice this yourself on Khan Academy right now: htt

• 04:47

### Who versus whom | The parts of speech | Grammar | Khan Academy

327 views / 0 likes - added

When do you use who, and when do you use whom? David, KA's grammarian, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/the-pronoun/e/relative-pronouns?utm_source=YT&utm_medium=Desc&u

• 05:41

### That versus which | The parts of speech | Grammar | Khan Academy

306 views / 0 likes - added

Much has been made of the distinction between "that" and "which" in English, but it can mostly be summed up in two points: 1. "That" doesn't work so well with commas. 2. "Which" doesn't work so well with people. David the Grammarian explains. Watch the ne

• 01:56

### Relative pronouns | The parts of speech | Grammar | Khan Academy

458 views / 0 likes - added

We use the relative pronouns to connect clauses together, like "the man *who sold the world* is coming over for dinner." David, KA's Grammar Fellow, explains. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofspeech/the-pronoun/

• 05:10

### Reflexive pronouns | The parts of speech | Grammar | Khan Academy

341 views / 0 likes - added

We use reflexive pronouns (like "herself" and "ourselves") when the subject and the object of a sentence are the same thing. David, KA's Grammar Fellow, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/gra

• 04:52

### Possessive pronouns | The parts of speech | Grammar | Khan Academy

409 views / 0 likes - added

We can use pronouns to show possession relationships, describing what things belong to which people, like "her shoe" or "the book is mine." Possessive pronouns come in two flavors: adjective and noun! David, KA's resident grammarian, covers the difference

• 03:15

### Personal pronouns | The parts of speech | Grammar | Khan Academy

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Let's meet the personal pronouns! Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/the-pronoun/e/meet-the-personal-pronoun?utm_source=YT&utm_medium=Desc&utm_campaign=grammar Watch the next less

• 02:00

### What is a pronoun? | The parts of speech | Grammar | Khan Academy

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Pronouns are words that can replace nouns, like the way "it" replaces "elephant" in "I looked at the elephant. It was grey." Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/the-pronoun/e/the-q

• 04:53

### Modal verbs | The parts of speech | Grammar | Khan Academy

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There's a class of helper verbs known as modals that we use to express a bunch of conditions: we can use them to give advice, make guesses at how necessary or likely something is, make requests of people, and so on. They're super useful. Practice this you

• 02:11

### Perfect progressive aspect | The parts of speech | Grammar | Khan Academy

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We use the perfect progressive aspect to talk about an action that was once ongoing, but has since completed, like "I had been waiting for twenty minutes." Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/pa

• 02:31

### Perfect Aspect | The parts of speech | Grammar | Khan Academy

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If verb tense allows you to control the past, the present, and the future, then aspect gives you even finer control over time. David, Khan Academy's resident grammarian, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.o

• 02:45

### Progressive Aspect | The parts of speech | Grammar | Khan Academy

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If verb tense allows you to control the past, the present, and the future, then aspect gives you even finer control over time. David, Khan Academy's resident grammarian, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.o

• 01:32

### Simple Aspect | The parts of speech | Grammar | Khan Academy

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If verb tense allows you to control the past, the present, and the future, then aspect gives you even finer control over time. David, Khan Academy's resident grammarian, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.o

• 01:50

### Introduction to verb aspect | The parts of speech | Grammar | Khan Academy

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If verb tense allows you to control the past, the present, and the future, then aspect gives you even finer control over time. David, Khan Academy's resident grammarian, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.o

• 02:53

### The truly irregular verbs | The parts of speech | Grammar | Khan Academy

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Some irregular verbs just won't be categorized. They don't fit into neat little boxes. These are those verbs. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs/e/intro-to-irregular

• 03:14

### The irregular verb gets taken for a ride | Grammar | Khan Academy

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This group of irregular verbs have vowel sounds that change in a predictable way, when they go from the present to the past tense. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs

• 03:11

### The vowel-shift irregular verb | The parts of speech | Grammar | Khan Academy

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This group of irregular verbs have vowel sounds that change in a predictable way, when they go from the present to the past tense. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs

• 01:53

### The funky -ed irregular verb | The parts of speech | Grammar | Khan Academy

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These are the most regular of the irregular verbs; while they don't behave exactly like regular verbs, like present tense "walk" become past tense "walked", they do maintain the "-ed" sound. It's just spelled differently. Practice this yourself on Khan Ac

• 03:29

### Introduction to irregular verbs | The parts of speech | Grammar | Khan Academy

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Words like "walk" and "look" are regular verbs – they behave in a predictable way. But there's a whole class of words in English, called irregular verbs, that are harder to predict. David, KA's Grammar Fellow, explains. Practice this yourself on Khan Acad

• 03:02

### Linking verbs | The parts of speech | Grammar | Khan Academy

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In a previous video, we established that one thing verbs can do is show actions, like "the bear runs." Verbs can also link ideas to one another, like "the bear looks cheerful." Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofs

• 02:54

### Helping verbs | The parts of speech | Grammar | Khan Academy

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We've established that verbs can show actions and link ideas together. Now, let's talk about how some verbs can be used to help other verbs. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/gra

• 02:50

### The future tense | The parts of speech | Grammar | Khan Academy

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When you want to talk about the future in English, you use the future tense. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs/v/linking-verbs-the-parts-of-speech-grammar?utm_source=YT&utm_medium=Desc&utm_ca

• 02:00

### The past tense | The parts of speech | Grammar | Khan Academy

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When you want to talk about events that have already happened, you use the past tense. Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs/v/the-future-tense-verbs-the-parts-of-speech?utm_source=YT&utm_medium=

• 02:01

### The present tense | The parts of speech | Grammar | Khan Academy

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How do we talk about things that are happening right now? Watch the next lesson: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs/v/the-past-tense-verbs-the-parts-of-speech?utm_source=YT&utm_medium=Desc&utm_campaign=grammar Misse

• 01:46

### Introduction to verb tense | The parts of speech | Grammar | Khan Academy

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An understanding of verb tense will make you into a TIME WIZARD, with the ability to control the past, the present, and the future – with your words, anyway. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/

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