Recently added videos

00:26
Sesame Street: Sophie Turner's Joke | #ShareTheLaughter Challenge

491 views / 0 likes - added 6 years ago

Sophie Turner has joined the #ShareTheLaughter challenge! To join, post a video telling a joke and challenge your friends to do the same! Make sure to use the #ShareTheLaughter -- Subscribe to the Sesame Street Channel here: http://www.youtube.com/subscri
05:29
What Eclipses Have Done for Science

477 views / 0 likes - added 6 years ago

Eclipses have been aiding scientists throughout history, from helping measure the width of the Atlantic ocean and verifying Einstein's theory of general relativity, to allowing NASA to attempt a thermal mapping of Mercury. Subscribe for regular science vi
16:36
Q&A - The Physics of Life: How Water Folds Proteins - with Sylvia McLain

598 views / 0 likes - added 6 years ago

Can we predict protein folding? How do you trap proteins? Sylvia McLain answers questions from the audience. Subscribe for regular science videos: http://bit.ly/RiSubscRibe Watch the full talk here: https://youtu.be/SaSntOkK-Vk Sylvia McLain is a Research
45:08 Popular
The Physics of Life: How Water Folds Proteins - with Sylvia McLain

944 views / 0 likes - added 6 years ago

Sorry about the audio problems for the first 30 seconds or so - stick with it, it levels out soon. Proteins are arguably the most important biological components in any living creature but only now are we beginning to look into the role water plays in the
08:02 Popular
Why Holding Your Breath For 24 Minutes Is Almost Impossible | WIRED

892 views / 0 likes - added 6 years ago

Spanish freediver Ah-leysh Segura held his breath for 24 minutes and 3 seconds in 2016. How is that possible? Here's how. Still haven’t subscribed to WIRED on YouTube? ►► http://wrd.cm/15fP7B7 CONNECT WITH WIRED Web: http://wired.com Twitter: https://twit
01:17
"Transient electronics" vanish when wet.

531 views / 0 likes - added 6 years ago

New circuits dissolve right on cue. Read more: http://scim.ag/2xD2wlI Read the research (free): http://scim.ag/2xD3VJd
01:03
Snakebot picks up objects and climbs walls

506 views / 0 likes - added 6 years ago

The repeating modules in this writhing robot use suction to squirm like a snake. Learn more: http://scim.ag/2vsfR2M Read the paper: robotics.sciencemag.org/content/2/9/eaan6357
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02:49
VR Theme Park Hopes to Push Public Pickup

621 views / 0 likes - added 6 years ago

VR World is a virtual reality theme park that presents curated video games and 360-degree artistic cultural experiences in order to help the public overcome some of the barriers that have prevented mass adoption. The team wants to prime people for the VR
02:23
What Is a Skin Allergy?

521 views / 0 likes - added 6 years ago

Poison ivy or a new perfume making you break out and itch? Your skin normally works as if in harmony to protect you from infection, but sometimes the tune your killer T cells are playing is bad news for your skin cells. Produced with support from SC Johns
01:46 Popular
The SpongeBob SquarePants Musical: ‘(JUST A) Simple Sponge' Lyric Video ft. Brendon Urie | Nick

1,038 views / 0 likes - added 6 years ago

SpongeBob SquarePants is coming to Broadway in a brand new musical! Sing-along to '(Just A) Simple Sponge' written by Grammy-award winning Brendon Urie of Panic! At the Disco. #AD Previews begin Nov 6th. Hear the full song here! (https://youtu.be/Y5TCOq0r
01:38 Popular
The 'Epic SpongeBob Quotes' Megamix Music Video

774 views / 2 likes - added 6 years ago

Everyone LOVES to quote SpongeBob. So to celebrate these funny and memorable lines, we’ve created an EPIC megamix for you! Now you can go JELLYFISH-JAM OUT with these quotes and let us know which ones we missed! Catch more SpongeBob on Nickelodeon. #Nick
01:31 Popular
Music Monday: 'Back to School' Sing-Along Music Video w/ SpongeBob, The Loud House, & More! | Nick

1,457 views / 2 likes - added 6 years ago

Bummed about the end of Summer? Don't be! Nickelodeon's Back to School Music Monday is giving you all the reasons to get psyched for school. Catch more of SpongeBob SquarePants, The Loud House, Henry Danger, The Thundermans, School of Rock, Bunsen is a Be
02:36
Flying High With the First Family of Skytypers

530 views / 0 likes - added 6 years ago

Ever considered writing a message in the clouds? Greg and Stephen Stinis are the guys to call. The father-son team run the Chico, California-based company SkyTypers, where they pilot airplanes to "write" messages and advertisements in the sky using specia
01:48
Europe's Largest Monument Marks Napoleon's Surrender

500 views / 0 likes - added 6 years ago

Standing nearly 300 feet tall, Europe’s largest monument is a dedication to the army that defeated Napoleon. Named after the battle that took place in 1813, The Monument to the Battle of the Nations is located in Leipzig, Germany, at the very site where N
03:20 Popular
Play With Every Toy From Your Childhood at This Museum

702 views / 0 likes - added 6 years ago

Ready your senses for nostalgia overdrive: the Strong Museum in Rochester, New York, has every toy from your childhood and then some. Known as the “Museum of Play,” inside, you’ll find a colorful collection of more than 500,000 objects that represent the
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14:21
The Story of Us: Immigrants Building an American Dream

596 views / 2 likes - added 6 years ago

In this reel, we follow the stories of some incredible individuals making a new life for themselves in America. We meet a Holocaust survivor who has tailored custom suits for every American President since Eisenhower, witness an incredible friendship betw
11:29
Art of Epic Proportions

578 views / 0 likes - added 6 years ago

In this reel, art goes BIG. We start off in the mountains of Utah to meet a man creating masterpieces in the snow, one step at a time, then travel to Mexico to visit a town that used art to create peace (in a big way), and meet the first female bathhouse
01:30
Step into the Sewage Cathedral

692 views / 0 likes - added 6 years ago

Think sewage treatment facilities aren’t glamorous? English engineers from the 19th century would disagree. The Crossness Pumping Station in East London was one of the first of its kind, and it drew visitors from around the world. Instead of bland walls,
01:38
See How This Canadian Family Builds Their 20-Foot-Tall Snowman

529 views / 0 likes - added 6 years ago

#Outrageous_Acts Dominate your neighborhood with your 20 ft. tall snowman, like this Canadian family did. Learn all their tricks! Full Episodes Streaming FREE: https://www.sciencechannel.com/tv-shows/outrageous-acts-of-science/ Subscribe to Science Channe
05:40 Popular
Fantastic Fall Hacks | LIFE HACKS FOR KIDS

1,046 views / 3 likes - added 6 years ago

Gillian is here with some fantastic hacks for guaranteed fun all fall! → Credits ← Host: Gillian Alaire Espina Studio Teacher: Julie Stinson Director: Jeannie Roshar Writer: Jeannie Roshar Executive Producers: Jeannie Roshar and Kelly Frazier Segment Prod
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07:14 Popular
DIY Trolls Pencil Toppers | TROLLS

714 views / 2 likes - added 6 years ago

Lily shows you how to make some Troll-rific back-to-school supplies with these DIY Poppy, Branch, and Guy Diamond pencil toppers! Materials: Polymer clay colors for Poppy: Light pink, bright pink, teal, and green Polymer clay colors for Branch: Teal, dark
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04:35 Popular
How to SURVIVE a Tsunami | SURVIVAL HACKS

2,392 views / 22 likes - added 6 years ago

SITUATION: you see the sea recede, swell up, and prepare to come crashing down in a TSUNAMI! Join host Grizzly Griddles as he bushwhacks and hacks his way through the DEADLIEST survival scenarios on Earth! → Credits ← Alex Hoffman as "Grizzly Griddles" Di
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01:55 Popular
Mystery box challenge // Homemade Science with Bruce Yeany

721 views / 0 likes - added 6 years ago

Mystery boxes challenge students to figure out a way to reproduce it's operation and build their own version of it. This particular challenge has more than one solution. Since this is still a project used in my classroom, it's method of operation is not r
04:21 Popular
Combination lock demonstration /// Homemade Science with Bruce Yeany

748 views / 0 likes - added 6 years ago

Homemade lock A large see through combination lock offers students a look at the operation of a lock mechanism that normally remains hidden. 64000 possible combinations but only one will open it. Homemade science is a collection of classroom tested ideas,
02:03 Popular
no magnet motor /// Homemade Science with Bruce Yeany

865 views / 0 likes - added 6 years ago

This simple motor uses two coils. The first coil is the armature that spins and the second coil replaces the permanent magnet that is usually mounted on the base. Homemade science is a collection of classroom tested ideas, suggestions, projects, and exper
01:32 Popular
This 12-ton robot will represent Team USA in an epic robot duel

871 views / 0 likes - added 6 years ago

MegaBot Inc. has created the Eagle Prime, a MK3-class robot that is built to fight. Equipped with two pilots, the Eagle Prime will be going head to head against Team Japan in the Giant Robot Duel. Read more: http://www.businessinsider.com/sai FACEBOOK: ht
01:31
Harvard University is creating robotic insects to monitor the environment

488 views / 0 likes - added 6 years ago

RoboBees are being made at Harvard's Wyss Institute. They can be used for environmental monitoring, search and rescue, and crop pollination. Read more: http://www.businessinsider.com/sai FACEBOOK: https://www.facebook.com/techinsider TWITTER: https://twit
01:35
This mirror has a personalized computer hidden inside

416 views / 0 likes - added 6 years ago

This smart mirror can control your connected home. It is controlled by your voice, and can connect to lights, cameras, thermostats, and more. Read more: http://www.businessinsider.com/sai FACEBOOK: https://www.facebook.com/techinsider TWITTER: https://twi
01:31
This device gives any bike an electric motor

471 views / 0 likes - added 6 years ago

UrbanX E-Bike Wheel replaces the front bike wheel to make any bike electric. Installation takes only 60 seconds and can take you as fast at 20 mph. Read more: http://www.businessinsider.com/sai FACEBOOK: https://www.facebook.com/techinsider TWITTER: https
04:51
Why America still uses Fahrenheit

591 views / 1 likes - added 6 years ago

Fahrenheit, explained to the rest of the world Since I've moved to the US in 2010, there's one thing that I still don't fully understand: the imperial system. Virtually every country on earth uses Celsius but America has yet to follow. Although it might n
01:25
A mountaintop view of the total solar eclipse

527 views / 0 likes - added 6 years ago

What 2017's total eclipse looked like from 9700 feet above sea level. Subscribe to our channel! http://goo.gl/0bsAjO If you're looking for the music in this video, it's available here: https://soundcloud.com/joeposner/vengreen-peak Vox.com is a news websi
26:12
Minecraft Xbox - Bed Hoppers [547]

687 views / 2 likes - added 6 years ago

Welcome to my Let's Play of the Xbox 360 Edition of Minecraft. These videos will showcase what I have been getting up to in Minecraft and everything I have built. In this episode I play my bed hoppers mini-game to see who will be employee of the month and
07:45 Popular
Introduction to chemistry

812 views / 0 likes - added 6 years ago

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
06:47 Popular
Noble gas configuration

781 views / 0 likes - added 6 years ago

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
07:50 Popular
pH and pKa relationship for buffers | Chemistry | Khan Academy

834 views / 0 likes - added 6 years ago

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/
06:52
2015 AP chemistry free response 5a

489 views / 0 likes - added 6 years ago

Finding the order of reaction for kinetics of bleaching food coloring. An alternative method of solving 2015 AP Chemistry free response 5a.
06:19
AP Chemistry multiple choice sample: Boiling points

535 views / 1 likes - added 6 years ago

Comparing the boiling point of nonane and 2,3,4-trifluoropentane. A sample multiple choice problem from the 2014 AP course description.
06:13 Popular
Rate constant k from half-life example | Knetics | Chemistry | Khan Academy

932 views / 0 likes - added 6 years ago

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
07:33 Popular
Ways to get a buffer solution | Chemistry | Khan Academy

1,260 views / 0 likes - added 6 years ago

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
05:53
Comparing Q vs K example | Chemical equilibrium | Chemistry | Khan Academy

589 views / 0 likes - added 6 years ago

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
07:14 Popular
Calculating internal energy and work example | Chemistry | Khan Academy

1,095 views / 0 likes - added 6 years ago

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-
07:32
Ionic bonds and Coulombs law

628 views / 1 likes - added 6 years ago

Introduction to how the strength of ionic bonds is related to Coulomb's law. Example of using Coulomb's law to explain differences in melting points of ionic compounds.
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Bond enthalpy and enthalpy of reaction | Chemistry | Khan Academy

1,152 views / 0 likes - added 6 years ago

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
07:37
Introduction to reaction quotient Qc | Chemical equilibrium | Chemistry | Khan Academy

653 views / 0 likes - added 6 years ago

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
07:57 Popular
Le Chatelier's principle: Worked example | Chemical equilibrium | Chemistry | Khan Academy

944 views / 0 likes - added 6 years ago

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
08:26
Conjugate acid-base pairs | Acids and bases | Chemistry | Khan Academy

587 views / 0 likes - added 6 years ago

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
11:57
The West Indies and the Southern colonies

604 views / 1 likes - added 6 years ago

Plantation agriculture, and slave labor, united the British colonies in the West Indies and the southern part of the eastern seaboard. In this video, Kim discusses the sugar islands of the Caribbean and how their reliance on enslaved Africans for labor de
11:46
Politics and native relations in the New England colonies

581 views / 0 likes - added 6 years ago

Although the New England colonies differed from the Chesapeake colonies in their economies and environments, both regions shared forms of government that were unusually democratic for the time period, as well as a policy of excluding Native Americans from
11:07
Society and religion in the New England colonies

509 views / 0 likes - added 6 years ago

The New England colonies organized society around the Puritan religion and family farming. In this video, Kim explores New England settlers' reasons for immigrating to North America and their farming and fishing economy.
10:33
The Middle colonies

661 views / 1 likes - added 6 years ago

The Middle colonies consisted of Pennsylvania, New Jersey, New York, and Delaware. Located in the middle of the Atlantic seaboard, their economies combined the industry of the North with the agriculture of the South. They were unusual, however, for their
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Khan Academy Live: SAT Writing

725 views / 0 likes - added 6 years ago

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
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Khan Academy Live: SAT Math

792 views / 0 likes - added 6 years ago

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
1:02:43
Khan Academy Live: AP US History

661 views / 0 likes - added 6 years ago

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
1:10:07
Khan Academy Live: AP Calculus

592 views / 0 likes - added 6 years ago

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
15:54
The History of the Democratic Party

469 views / 1 likes - added 6 years ago

This week, as America's attention is focused on the Democratic National Convention in Philadelphia, we bring you a quick overview of the history of the Democratic Party. 200+ years was hard to fit into 16 minutes, but we got most of the highlights, from J
02:48
United Kingdom vs Great Britain vs England primer

553 views / 0 likes - added 6 years ago

A primer on the United Kingom vs Great Britain vs England.
11:27
The History of the Republican Party

595 views / 1 likes - added 6 years ago

Heading into the 2016 Republican National Convention, we thought it would be a good time to do a quick history of the GOP, from its origins before the Civil War through the elections of Lincoln, Eisenhower and Reagan. And where does that elephant symbol c
02:46 Popular
Introduction to Grammar | Grammar | Khan Academy

970 views / 0 likes - added 6 years ago

Khan Academy Grammarian David Rheinstrom welcomes you to his favorite topic: the study of language, its rules, and its conventions. By understanding English – by speaking it, by writing it, by reading this very sentence – you are a grammarian yourself! Wa
04:57
Irregular plural nouns | foreign plurals | The parts of speech | Grammar | Khan Academy

642 views / 0 likes - added 6 years ago

You don't need to know how to speak Latin and Greek in order to understand English, but some words in English come from those languages. It's helpful to know how some Greek and Latin words change from singular to plural. Practice this yourself on Khan Aca
01:26
Introduction to verbs | The parts of speech | Grammar | Khan Academy

618 views / 0 likes - added 6 years ago

Let's explore what verbs are, and what they do! David, KA's Grammar Fellow, explains. Practice this yourself on Khan Academy right now: https://www.khanacademy.org/humanities/grammar/partsofspeech/grammar-verbs/e/identifying-verbs?utm_source=YT&utm_medium
01:46 Popular
Introduction to verb tense | The parts of speech | Grammar | Khan Academy

811 views / 0 likes - added 6 years ago

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

810 views / 0 likes - added 6 years ago

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
02:00 Popular
The past tense | The parts of speech | Grammar | Khan Academy

929 views / 0 likes - added 6 years ago

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=
02:50 Popular
The future tense | The parts of speech | Grammar | Khan Academy

966 views / 0 likes - added 6 years ago

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
02:54 Popular
Helping verbs | The parts of speech | Grammar | Khan Academy

1,152 views / 0 likes - added 6 years ago

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

1,657 views / 0 likes - added 6 years ago

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
03:29
Introduction to irregular verbs | The parts of speech | Grammar | Khan Academy

568 views / 0 likes - added 6 years ago

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
01:53
The funky -ed irregular verb | The parts of speech | Grammar | Khan Academy

572 views / 1 likes - added 6 years ago

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
03:11 Popular
The vowel-shift irregular verb | The parts of speech | Grammar | Khan Academy

1,190 views / 0 likes - added 6 years ago

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
03:14
The irregular verb gets taken for a ride | Grammar | Khan Academy

591 views / 0 likes - added 6 years ago

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
02:53 Popular
The truly irregular verbs | The parts of speech | Grammar | Khan Academy

1,034 views / 0 likes - added 6 years ago

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
01:50
Introduction to verb aspect | The parts of speech | Grammar | Khan Academy

575 views / 0 likes - added 6 years ago

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

608 views / 0 likes - added 6 years ago

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

528 views / 0 likes - added 6 years ago

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
02:31
Perfect Aspect | The parts of speech | Grammar | Khan Academy

689 views / 0 likes - added 6 years ago

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
02:11
Perfect progressive aspect | The parts of speech | Grammar | Khan Academy

539 views / 0 likes - added 6 years ago

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
04:53 Popular
Modal verbs | The parts of speech | Grammar | Khan Academy

1,472 views / 0 likes - added 6 years ago

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

1,078 views / 0 likes - added 6 years ago

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
03:15
Personal pronouns | The parts of speech | Grammar | Khan Academy

654 views / 0 likes - added 6 years ago

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
04:52
Possessive pronouns | The parts of speech | Grammar | Khan Academy

670 views / 0 likes - added 6 years ago

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

1,088 views / 0 likes - added 6 years ago

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
01:56 Popular
Relative pronouns | The parts of speech | Grammar | Khan Academy

1,132 views / 0 likes - added 6 years ago

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/
05:41 Popular
That versus which | The parts of speech | Grammar | Khan Academy

970 views / 0 likes - added 6 years ago

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
04:47
Who versus whom | The parts of speech | Grammar | Khan Academy

598 views / 0 likes - added 6 years ago

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
05:34
Subject and object pronouns | The parts of speech | Grammar | Khan Academy

531 views / 0 likes - added 6 years ago

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

874 views / 0 likes - added 6 years ago

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
05:18 Popular
Pronoun number | The parts of speech | Grammar | Khan Academy

874 views / 0 likes - added 6 years ago

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
05:03 Popular
Indefinite Pronouns | The parts of speech | Grammar | Khan Academy

1,134 views / 0 likes - added 6 years ago

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
02:55 Popular
Emphatic pronouns | The parts of speech | Grammar | Khan Academy

893 views / 0 likes - added 6 years ago

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

517 views / 0 likes - added 6 years ago

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
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Adjectives and commas | Adjectives | Khan Academy

700 views / 1 likes - added 6 years ago

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-
04:33 Popular
Coordinating conjunctions | The parts of speech | Grammar | Khan Academy

997 views / 0 likes - added 6 years ago

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
05:27 Popular
Subordinating conjunctions | The parts of speech | Grammar | Khan Academy

1,247 views / 0 likes - added 6 years ago

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
03:12 Popular
Correlative conjunctions | The parts of speech | Grammar | Khan Academy

1,015 views / 0 likes - added 6 years ago

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
06:08 Popular
Beginning sentences with conjunctions | The parts of speech | Grammar | Khan Academy

786 views / 0 likes - added 6 years ago

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
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Three ways to end a sentence | Punctuation | Khan Academy

586 views / 0 likes - added 6 years ago

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
03:59 Popular
Meet the Comma | Punctuation | Grammar | Khan Academy

911 views / 1 likes - added 6 years ago

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/
02:18 Popular
Salutations and valedictions | Punctuation | Grammar | Khan Academy

829 views / 0 likes - added 6 years ago

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
03:19 Popular
Commas in space and time | The Comma | Punctuation | Khan Academy

827 views / 0 likes - added 6 years ago

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
04:35
Commas and introductory elements | Punctuation | Grammar | Khan Academy

531 views / 0 likes - added 6 years ago

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
01:51
Punctuating a list | Punctuation | Grammar | Khan Academy

584 views / 0 likes - added 6 years ago

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=
03:24 Popular
More uses for commas | Punctuation | Grammar | Khan Academy

805 views / 0 likes - added 6 years ago

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
03:00 Popular
Commas in dialogue | Punctuation | Grammar | Khan Academy

1,170 views / 1 likes - added 6 years ago

“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
03:00
Appositives | Punctuation | Grammar | Khan Academy

632 views / 0 likes - added 6 years ago

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