Environmental

04:42 Popular
Home Sweet Habitat: Crash Course Kids #21.1

8 years ago / 1,102 views

How would a Polar Bear do if you put it in the desert? Not well. But why? Why can't anything live anywhere? Well, this has to do with Habitats and how animals (including humans) are suited for living in one place over another. In this episode, Sabrina tal
03:05
Should We All Be Eating Insects?

8 years ago / 617 views

Could these creepy crawlers be the future of food? HOW TO EAT BUGS: http://bit.ly/1jLnYXe Subscribe! It's free: http://bit.ly/10kWnZ7 --- Follow us (Links Below) --- Instagram and Twitter: @whalewatchmeplz and @mitchellmoffit Clickable: http://bit.ly/16F1
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02:56 Popular
Paper Towel Vs Hand Dryers

8 years ago / 736 views

Which is more hygienic - paper towel or hand dryers? SUBSCRIBE! It's free: http://bit.ly/10kWnZ7 Get Your Free Audiobook: http://bit.ly/XIcZpz --- Links to follow us below --- Instagram and Twitter: @whalewatchmeplz and @mitchellmoffit Clickable: http://b
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03:34 Popular
Amazing Energy Facts To Blow Your Mind

8 years ago / 960 views

Here are some amazing facts about energy to shock your brain! Is Wind Energy Worth It? (VIDEO): http://youtu.be/Dzf9X7m8-9o SUBSCRIBE! http://bit.ly/10kWnZ7 Send us stuff! ASAPSCIENCE INC. P.O. BOX 93, Toronto P, TORONTO, ON, M5S2S6 Instagram and Twitter:
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04:08 Popular
What If Humans Disappeared?

8 years ago / 701 views

If we suddenly disappeared, what would happen to our planet? Squarespace: http://squarespace.com/asap click for a free trial and 10% off Why Do You Mishear Lyrics?: http://youtu.be/5cmOKiGklcQ GET THE BOOK! http://asapscience.com/book Subscribe! (It's fre
03:29 Popular
What Happens If All The Bees Die?

8 years ago / 1,102 views

Will we go extinct if the bees all die? Get FREE audiobook: http://audible.com/asap Watch AsapSCIENCE LIVE! https://youtu.be/yUofDfhaIMM Get the book elsewhere: http://asapscience.com/book Subscribe! (It's free): http://bit.ly/asapsci Written by Amanda Ed
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03:06
The Science Of DOGS

8 years ago / 626 views

Man and woman's best friend! CATS vs DOGS debate: https://youtu.be/tR7Eq09vfjU Subscribe for more: http://bit.ly/asapsci GET THE ASAPSCIENCE BOOK: http://asapscience.com/book/ Written by: Rachel Salt, Gregory Brown and Mitchell Moffit FOLLOW US! Instagram
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05:10 Popular
Glow On: Crash Course Kids #20.2

8 years ago / 1,057 views

So, have you ever wondered why some stars are brighter than others? You might think it's because they're closer to us, but that's not the whole story? In this episode of Crash Course Kids, Sabrina chats about how stars glow and how astronomers judge their
02:57 Popular
Why Do Rivers Curve?

8 years ago / 787 views

We're now on Patreon! Please support us at: http://www.patreon.com/minuteearth Can you find an oxbow lake in GoogleEarth? Share your findings (pictures or coordinates) on Twitter, Facebook and other social media using the hashtag #oxbowlake And subscribe!
03:33 Popular
Why Poor Places Are More Diverse

8 years ago / 765 views

Thanks to The Kwongan Foundation at the University of Western Australia for supporting this video: http://www.plants.uwa.edu.au/alumni/kwongan MinuteEarth is now on Patreon! Please support us at: http://www.patreon.com/minuteearth And subscribe! - http://
02:47 Popular
This Is Your Brain On Extreme Weather

8 years ago / 831 views

Thanks to http://www.audible.com/ for supporting this video. Download your free audiobook at https://www.audible.com/minuteearth Thanks also to our Patreon patrons: - @AntoineCoeur - salar tel - @TodayIFoundOut1 - @82abhilash - Emil Kampp and our Subbable
06:05 Popular
Jellyfish Stinging In MICROSCOPIC SLOW MOTION - Smarter Every Day 120

8 years ago / 872 views

Tweet⇒ http://bit.ly/JELLYSTING FB⇒ http://bit.ly/JELLYStingFB Official comment thread on Reddit here: http://bit.ly/1qi3YxU Shot with a Phantom Miro Camera http://bit.ly/NewPhantomMiro More info! ⇊ Click below for more links! ⇊ ~~~~~~~~~~~~~~~~~~~~~~~~~~
09:04 Popular
Inside A Kangaroo Pouch - Smarter Every Day 139

8 years ago / 1,098 views

Patreon Support Link: http://www.patreon.com/smartereveryday Free Audio Book ⇒ http://bit.ly/AudibleSED ⇐ Tweet ⇒http://bit.ly/RooPouchTWT ⇐ Post to FB⇒ http://bit.ly/RooPouchFB I still don't know if male kangaroos have nipples. Seriously... the internet
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04:58
Why Insects Love Summer – Flight, Fights And Booze

8 years ago / 600 views

Have you ever wondered what happens when insects get drunk? Can you tell the temperature by the frequency of a cricket’s chirps? Do you know what temperature a butterfly has to be to take off? Kate buzzes around the science of summer insects. Subscribe fo
04:01
An Astronaut's View Of Earth

8 years ago / 566 views

What it's like to see the Earth from orbit. Special thanks to Col. Chris Hadfield for chatting with me. http://chrishadfield.ca/ Space imagery courtesy of NASA and the ESA http://eol.jsc.nasa.gov/ http://www.esa.int/spaceinvideos/Videos Music by Kevin Mac
04:29
Evolutionarily Stable Strategies Ft. Richard Dawkins

8 years ago / 643 views

When evolution favours a stable ratio of traits rather than one dominant trait. Check out Audible: http://bit.ly/AudibleVe Animation by The Lyosacks: https://www.youtube.com/TheLyosacks Hosting Neil Degrasse Tyson, info and tickets: http://bit.ly/NDTandVe
08:04 Popular
Osmosis

8 years ago / 999 views

Osmosis of water (or any solvent) from area of lower solute concentration to areas of higher solute concentration. through a semipermeable membrane.
02:49 Popular
Climate Change: Earth's Giant Game Of Tetris - Joss Fong

8 years ago / 956 views

View full lesson: http://ed.ted.com/lessons/climate-change-earth-s-giant-game-of-tetris-joss-fong There's a game of Tetris happening on a global scale: The playing space is planet Earth, and all those pesky, stacking blocks represent carbon dioxide -- a g
03:37 Popular
How Tsunamis Work - Alex Gendler

8 years ago / 3,135 views

View full lesson: http://ed.ted.com/lessons/how-tsunamis-work-alex-gendler The immense swell of a tsunami can grow up to 100 feet, hitting speeds over 500 mph -- a treacherous combination for anyone or anything in its path. Alex Gendler details the causes
03:59 Popular
Why Do Honeybees Love Hexagons? - Zack Patterson And Andy Peterson

8 years ago / 839 views

View full lesson: http://ed.ted.com/lessons/why-do-honeybees-love-hexagons-zack-patterson-and-andy-peterson Honeybees are some of nature's finest mathematicians. Not only can they calculate angles and comprehend the roundness of the earth, these smart ins
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04:43 Popular
Why Aren't We Only Using Solar Power? - Alexandros George Charalambides

8 years ago / 1,272 views

View full lesson: http://ed.ted.com/lessons/why-aren-t-we-only-using-solar-power-alexandros-george-charalambides Solar power is cheaper and more sustainable than our current coal-fueled power plants, so why haven't we made the switch? The real culprits he
03:24 Popular
Attack Of The Killer Algae - Eric Noel Muñoz

8 years ago / 871 views

View full lesson: http://ed.ted.com/lessons/attack-of-the-killer-algae-eric-noel-munoz As benign as it may look up close, the tiny seaweed Caulerpa taxifolia can wreak quite a bit of havoc on coastal ecosystems. This super algae is very adaptable; it also
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Training Trees

8 years ago / 610 views

Even basic evolutionary trees reveal insights into how different species are connected. Play the Evolution Lab: http://www.pbs.org/nova/labs/lab/evolution/ NOVA Labs Facebook: https://www.facebook.com/theNOVALabs NOVA Labs Twitter: https://twitter.com/the
03:07
How To Kick Our Fossil Fuel Habit In One Step

8 years ago / 616 views

Solar energy is clean, renewable and abundant—so why do we still burn fossil fuels to generate the majority of our electricity? En Español: http://youtu.be/MamiwkyoS3w ↓Want more info?↓ After you watch, head over to NOVA Next to learn more about the curre
03:18
Earth Has An Expiration Date

8 years ago / 610 views

The sun has been growing hotter ever since its birth. Over time, the sun will also grow larger. This growth will eventually cause a cataclysmic greenhouse event as the Earth moves further out of the sun's habitable zone. Once this happens, oceans that hav
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02:23 Popular
Why Do Planes Fly So High?

8 years ago / 822 views

We’ve all been flying high ever since the development of the jet engine in the mid-1950s. But why were jets were designed to fly at those high altitudes in the first place? Hosted by: Hank Green ---------- Dooblydoo thanks go to the following Patreon supp
05:12
Why Summer Is Hot But We Can't Predict The Weather

8 years ago / 696 views

Kate tries to use science to find the perfect summer holiday destination, asks why summer isn't the same everywhere, and investigates the many-layered science of the seasons. Subscribe for regular science videos: http://bit.ly/RiSubscRibe If climate and t
04:31 Popular
Five Reasons To Thank Plankton

8 years ago / 711 views

For too long plankton have slaved away in obscurity, making the world a better place for generations of ungrateful humans. Until now. Find out how much you owe these little guys with Nature Video’s Five Reasons To Thank Plankton. For more videos of super
03:27 Popular
What Do Healthy Ecosystems Sound Like? | NOVA

8 years ago / 1,874 views

What can sound tell us about the health of an ecosystem? NOVA Facebook: https://www.facebook.com/NOVAonline NOVA Twitter: https://twitter.com/novapbs PRODUCTION CREDITS Produced, Animated and Narrated by Elizabeth Gillis Editorial help from Anna Rothschil
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DNA Spells Evolution

8 years ago / 616 views

DNA weaves together the tapestry of life on Earth. It mutates, which can lead to variation among organisms. Watch how natural selection relies on DNA to mold organisms to suit their environments. Play the Evolution Lab: http://www.pbs.org/nova/labs/lab/ev
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05:02
Evolution 101

8 years ago / 664 views

Every creature that’s ever lived, including you, has been honed by the powerful force of evolution. Play NOVA's Evolution Lab to learn how it’s responsible for the explosion of Earth's biodiversity. Play the Evolution Lab: http://www.pbs.org/nova/labs/lab
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05:13 Popular
Inside The Minds Of Animals - Bryan B Rasmussen

8 years ago / 856 views

View full lesson: http://ed.ted.com/lessons/inside-the-minds-of-animals-bryan-b-rasmussen Do animals think? It’s a question that has intrigued scientists for thousands of years, inspiring them to come up with different methods and criteria to measure the
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04:29 Popular
How Does A Canyon Become Grand?

8 years ago / 1,484 views

And a very Grand Canyon it is… Subscribe: http://bit.ly/iotbs_sub Twitter: @jtotheizzoe @okaytobesmart ↓ More info and sources below ↓ Thanks to Mike from PBS Idea Channel and Jamin from PBS Game/Show for hanging out at the Grand Canyon with me! https://w
06:23
Your Salad Is Trying To Kill You

8 years ago / 651 views

The dose makes the poison… Subscribe: http://bit.ly/iotbs_sub Twitter: @jtotheizzoe @okaytobesmart ↓ More info and sources below ↓ Plants are the most important source of nutrients for pretty much all of Earth's animals, and many of the planet's bacteria
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03:59 Popular
How A Bee Becomes Queen

8 years ago / 967 views

Royal jelly! For bees, it’s what makes all the difference between a queen and a worker. Hosted by: Hank Green ---------- Dooblydoo thanks go to the following Patreon supporters -- we couldn't make SciShow without them! Shout out to Justin Ove, Justin Lent
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11:26 Popular
Why Are GMOs Bad?

8 years ago / 1,126 views

Why are GMOs bad? They aren’t. They just aren’t, not intrinsically, and certainly not for your health. We’ve been eating them for decades with no ill effects, which makes sense, because a genetically modified organism is simply an organism, like every oth
11:48 Popular
How Evolution Works

8 years ago / 1,770 views

The mechanisms of evolution explained in one video. The theory of evolution explains how the enormous variety of life could come into existence. How it is possible for primitive life forms to spawn the millions of different creatures, that exist today. Un
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05:04 Popular
Fracking Explained: Opportunity Or Danger

8 years ago / 829 views

Fracking explained in five minutes. Fracking is a controversial topic. On the one side the gas drilling companies, on the other citizen opposed to this drilling method. Politicians are also divided on the matter. We try to take a neutral look on fracking.
05:05 Popular
The Gulf Stream & Climate Change

8 years ago / 941 views

Learn about the role of the sea in global warming. The global conveyer belt is part of the large-scale ocean circulation that is driven by differences in the density of the waters. It plays a key role in keeping the climate at balance and Europe warm. Glo
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07:22 Popular
Everything You Need To Know About Planet Earth

8 years ago / 815 views

Planet Earth is this solid thing you are standing on right now. In your everyday life you don't really waste a thought about how amazing this is. A giant, ancient, hot rock. How did it come into existence and how big is it really? You will be surprised. T
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05:18 Popular
Nuclear Energy Explained: How Does It Work? 1/3

8 years ago / 1,118 views

Nuclear Energy Explained: How does it work? Nuclear Energy is a controversial subject. The pro- and anti-nuclear lobbies fight furiously, and it's difficult to decide who is right. So we're trying to clear up the issue - in this video we discuss how we go
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04:10 Popular
3 Reasons Why Nuclear Energy Is Terrible! 2/3

8 years ago / 1,128 views

Nuclear energy might be a failed experiment. In over sixty years the technology has not only failed to keep its promise of cheap, clean and safe energy, it also caused major catastrophes and enabled more nuclear weapons while the nuclear waste problem is
04:21 Popular
3 Reasons Why Nuclear Energy Is Awesome! 3/3

8 years ago / 1,673 views

Nuclear energy might have a lot of unused potential. Not only is it one of the best mid term solutions for global warming bit despite what gut feeling tells us, it has saved millions of lives. By investing more into better technologies we might be able to
06:20 Popular
The Death Of Bees Explained – Parasites, Poison And Humans

8 years ago / 1,386 views

In 2015 the bees are still dying in masses. Which at first seems not very important until you realize that one third of all food humans consume would disappear with them. Millions could starve. The foes bees face are truly horrifying – some are a direct c
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02:16 Popular
Why Do Things Fade In The Sun?

8 years ago / 906 views

Have you ever noticed that sunlight makes colors fade? Join Quick Questions as we explore why that happens. Hosted by: Hank Green ---------- Dooblydoo thanks go to the following Patreon supporters -- we couldn't make SciShow without them! Shout out to Chr
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07:16 Popular
Should This Lake Exist?

8 years ago / 769 views

The Salton Sea is the largest body of water in California, home to the second most diverse group of birds in America and it exists by accident. Another great video on the Salton Sea: https://youtu.be/otIU6Py4K_A I used archive from this video. Music by Ke
05:23 Popular
How To Protect The Rainforest

8 years ago / 950 views

For our final installment in the Amazon Adventures series, I interviewed expedition leader Corine Vriesendorp about what it means to protect and conserve areas of the rainforest in spite of the overwhelming global demands for its natural resources. This i
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03:47 Popular
A Change Of Scenery: Crash Course Kids #17.2

8 years ago / 4,374 views

The world changes. It really does! But sometimes it changes so slowly that we don't notice it. Other times it changes REALLY FAST!!! In this episode of Crash Course Kids, Sabrina talks about some of the reasons things can change quickly or slowly. This fi
03:21 Popular
Why Do Some Species Thrive In Cities?

8 years ago / 714 views

Urban development can be tough on wildlife. But some plants and animals are adapting to our cities in surprising ways. Thanks to squarespace.com for supporting this video. Go build a website! http://www.squarespace.com/minuteearth (use your 10% discount c
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08:15
A Walk Around Chernobyl

8 years ago / 607 views

This is what a nuclear disaster area looks like. Check out Audible: http://bit.ly/AudibleVe Broadcast locations and times: North America: PBS, July 28 & 29 @ 10pm ET / 9pm Central Europe: ZDF/arte, July 31 @ 10pm Australia: SBS, August 6, 13, 20 @ 8:30pm
03:36 Popular
Origami At The Museum: Folding A Whale (Remix)

8 years ago / 855 views

Visit the American Museum of Natural History each holiday season to see one of New York’s most beloved displays, the Origami Holiday Tree—an annual tradition for more than forty years. Produced in partnership with OrigamiUSA, the tree is delightfully deco
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06:43 Popular
Shelf Life Episode 8 - Voyage Of The Giant Squid

8 years ago / 949 views

Getting a giant squid from New Zealand to New York is no easy feat. Curator Neil Landman tells the tale of a sizable specimen’s journey to the collections at the American Museum of Natural History, and Curator Mark Siddall explains why this giant cephalop
08:54 Popular
How Recycling Works

8 years ago / 1,463 views

Join SciShow as we explore what happens to your stuff after you toss it into the little green bin with the arrows on it. ---------- Dooblydoo thanks go to the following Patreon supporters -- we couldn't make SciShow without them! Shout out to Justin Ove,
04:18 Popular
The Fish With Human Teeth

8 years ago / 1,002 views

A fish with eerily human-like teeth was caught in a New Jersey lake. And scientists have learned to speak Bird! ---------- Dooblydoo thanks go to the following Patreon supporters -- we couldn't make SciShow without them! Shout out to Justin Ove, Justin Le
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Why Are Bugs Attracted To Light? - Smarter Every Day 103

8 years ago / 634 views

Download your free Audio Book Here: http://bit.ly/AudibleSED Seriously... it's a pretty cool way to support my video making habit. ⇊ Click to Expand! ⇊ Filmed on location in the Rainforests of Eastern Peru. I was on a tour run by Rainforest Expeditions (h
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06:01 Popular
Thomas Jefferson And The Giant Moose

8 years ago / 996 views

E pluribus moose-um Subscribe: http://bit.ly/iotbs_sub Twitter: @jtotheizzoe @okaytobesmart ↓ More info and sources below ↓ America’s first great science battle wasn’t the space race or the atom bomb, it was fought between Thomas Jefferson, a French noble
03:08 Popular
Should We Let Pandas Go Extinct?

8 years ago / 1,029 views

Thanks to http://www.harrys.com for supporting this video. Use the coupon code MINUTEEARTH for $5 off your order! http://www.harrys.com Thanks to our Patreon patrons: - @AntoineCoeur - Nicholas Buckendorf - Nasser Hamed Alminji - Jeff Straathof - Mark - f
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Why Are There Clouds?

8 years ago / 632 views

Thanks to the awesome science YouTube channel Animalogic for supporting this video. Check them out! https://www.youtube.com/channel/UCwg6_F2hDHYrqbNSGjmar4w?sub_confirmation=1 Thanks also to our Patreon patrons: - @AntoineCoeur - Jeff Straathof - Mark - f
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03:09 Popular
How Do Greenhouse Gases Actually Work?

8 years ago / 734 views

Thanks to Kurz Gesagt for illustrating this video! http://www.youtube.com/kurzgesagt And for composing the music!: https://soundcloud.com/epicmountain/minute-earth Thanks also to our Patreon patrons: - AshrafDude - Nasser Hamed Alminji - Jeff Straathof -
02:15 Popular
Is Climate Change Just A Lot Of Hot Air?

8 years ago / 1,084 views

Check out www.lynda.com/minuteearth for 10 days of free online courses http://www.lynda.com/ Illustrations by: Jesse Agar - https://www.youtube.com/user/ThisPlaceChannel Thanks also to our Patreon patrons: - Jeff Straathof - Mark - Maarten Bremer - Today
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03:15 Popular
Resources: Welcome To The Neighborhood - Crash Course Kids #2.1

8 years ago / 1,644 views

Welcome to the Neighborhood! Humans need a lot of things to survive (I'm sure you've noticed). We need food, water, and shelter and it takes a lot of resources to get all of those things. What are resources? In this episode of Crash Course Kids, Sabrina t
02:54 Popular
Why Raindrops Are Mathematically Impossible

8 years ago / 1,421 views

Rain shouldn't happen, according to basic physics. Click here to watch the MinuteEarth video about rain: https://www.youtube.com/watch?v=87v_9Bud7vw This video supported by Audible.com/minutephysics Thanks to the following Subbable subscribers for making
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02:34 Popular
Upside Down Mountains In Real Life

8 years ago / 798 views

Research on global mountain surface areas: http://bit.ly/1eJyqCM This video is supported by http://www.lynda.com/minutephysics Thanks to the following Subbable subscribers for making MinutePhysics possible: Marc Vigod @WeAretheProduct Knowledge Videos: ht
03:48 Popular
How To Detect A Secret Nuclear Test

8 years ago / 855 views

Thanks to the CTBTO for helping keep the world safe by detecting secret nuclear tests. http://www.ctbto.org http://www.twitter.com/ctbto_alerts http://www.facebook.com/CTBTO http://www.youtube.com/CTBTO Music by Nathaniel Schroeder http://www.soundcloud.c
03:37 Popular
The Science Of Lunch: Crash Course Kids #15.2

8 years ago / 3,583 views

Even an empty lunch sack is useful to science. You can examine it and come up with some traits. In this episode, Sabrina chats about things like malleability, hardness, conductivity, and magnetism. And all with lunch! This first series is based on 5th gra
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03:37 Popular
Up, Up & Away: Crash Course Kids #16.2

8 years ago / 997 views

So... what makes the wind? You might be surprised to learn that it has to do with two of Earth's spheres; The Hydrosphere and the Geosphere. In this episode of Crash Course Kids, Sabrina takes us to the beach to chat about how the wind comes into being an
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04:20 Popular
Monarch Caterpillar Changes To A Chrysalis

8 years ago / 1,023 views

The annual monarch migration is underway! Should you happen to spot a monarch caterpillar impersonating the letter 'J', watch it carefully. It might change from a caterpillar (the larva) to a chrysalis (the pupa) before your very eyes!
04:46 Popular
How To Make A Mummy - Len Bloch

8 years ago / 1,210 views

View full lesson: http://ed.ted.com/lessons/how-to-make-a-mummy-len-bloch As anyone who’s seen a mummy knows, ancient Egyptian priests went to a lot of trouble to evade decomposition. But how successful were they? Len Bloch details the mummification proce
05:39 Popular
Which Came First - Flowers Or Bees?

8 years ago / 839 views

Stop and smell the flowers… and watch this video Subscribe: http://bit.ly/iotbs_sub Twitter: @jtotheizzoe @okaytobesmart ↓ More info and sources below ↓ Bees and flowers have an amazingly close relationship. Flowers need bees in order to reproduce, and be
04:21 Popular
Why Are The Bees Dying?

8 years ago / 1,565 views

If bees go, will they take us with them? Subscribe: http://bit.ly/iotbs_sub Twitter: @jtotheizzoe @okaytobesmart ↓ More info and sources below ↓ Bees, wild and domesticated, are in big trouble. Bee colonies are dying off at alarming rates, and the cause i
05:22 Popular
The Essentials Of Energy

8 years ago / 889 views

Check out our whole series on ENERGY! http://bit.ly/1BnH5zu Subscribe: http://bit.ly/iotbs_sub Twitter: @okaytobesmart ↓ More info and sources below ↓ The world of energy is a confusing place. What’s better, nuclear or solar? What’s the difference between
06:31 Popular
Did Dinosaurs Really Go Extinct?

8 years ago / 1,174 views

Welcome to… Jurassic Pluck Subscribe: http://bit.ly/iotbs_sub Twitter: @jtotheizzoe @okaytobesmart ↓ More info and sources below ↓ Most people are taught that dinosaurs went extinct 66 million years ago when a giant meteor crashed into the Yucatan peninsu
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04:18 Popular
The Surprising Places We Waste Energy

8 years ago / 1,096 views

Check out our whole series on ENERGY! http://bit.ly/1BnH5zu Subscribe: http://bit.ly/iotbs_sub Twitter: @okaytobesmart ↓ More info and sources below ↓ We use a LOT of energy, but we waste a lot too. Where that waste happens might surprise, you though. We
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05:11 Popular
Will We Ever Run Out Of Oil?

8 years ago / 762 views

Check out our whole series on ENERGY! http://bit.ly/1BnH5zu Subscribe: http://bit.ly/iotbs_sub Twitter: @okaytobesmart ↓ More info and sources below ↓ We’ve heard news of “peak oil” and “the end of the oil age” for years now, but we keep coming up with wa
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04:56 Popular
Water Water Everywhere: Crash Course Kids #14.2

8 years ago / 1,690 views

So you know about Freshwater and Saltwater now and you know that there's not that much Freshwater for us (and other life) to get to. So how do different animals deal with different amounts of water where they live? In this episode of Crash Course Kids, Sa
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The Basics Of Freshwater: Crash Course Kids 14.1

8 years ago / 1,964 views

We have a lot of water on Earth, but we also can't actually drink much of it... or use it for farming. That's because most of the water on Earth is saltwater. We humans, like a lot of living things, need freshwater to survive. In this episode of Crash Cou
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How To Get Resources - Picky Pineapples: Crash Course Kids #2.2

8 years ago / 1,506 views

Want a Pineapple? If you want a pineapple, it's possible you can just run down to the store and get one. But, if you wanted to grow one, that's a lot more difficult depending on where you live. In this episode of Crash Course Kids, Sabrina talks about how
02:59 Popular
Down To Earth: Crash Course Kids #4.2

8 years ago / 1,626 views

In this episode of Crash Course Kids, Sabrina talks about why things on the bottom of the Earth, don't just fall off into space. Plus... PENGUINS! This first series is based on 5th grade science. We're super excited and hope you enjoy Crash Course Kids! /
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Vegetation Transformation: Crash Course Kids #5.2

8 years ago / 1,097 views

Have you ever seen a magic trick where one thing changes to another thing? Well, that's nothing compared to what plants can do through a process called photosynthesis. In this episode, Sabrina talks about how photosynthesis works! This first series is bas
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Four Spheres Part 1 (Geo And Bio): Crash Course Kids #6.1

8 years ago / 1,565 views

In this episode of Crash Course Kids, Sabrina talks about two of the four spheres that make up our planet; The Geosphere and the Biosphere. What's in these spheres? How do they affect us? How do they fit into the puzzle that is Earth? All is contained wit
03:31 Popular
Four Spheres Part 2 (Hydro And Atmo): Crash Course Kids #6.2

8 years ago / 1,343 views

The second part of our two part tale of the puzzle that is Earth. In this episode, Sabrina talks about the Hydrosphere and the Atmosphere and what is contained in each one. Let's dive in!!! This first series is based on 5th grade science. We're super exci
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Fabulous Food Chains: Crash Course Kids #7.1

8 years ago / 1,410 views

Everyone eats, right? But how does that food get the energy to power you? In this episode of Crash Course Kids, Sabrina talks about the way energy moves, or flows, through an ecosystem and how that movement forms Food Chains! This first series is based on
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03:19 Popular
The Dirt On Decomposers: Crash Course Kids #7.2

8 years ago / 2,131 views

We've talked about food chains and how energy moves through an ecosystem, but let's take a step back and see how everything starts... and ends. Decomposers! This first series is based on 5th grade science. We're super excited and hope you enjoy Crash Cour
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Earth's Rotation & Revolution: Crash Course Kids 8.1

8 years ago / 1,512 views

So, have you ever wondered why we have seasons? Or maybe where the sun goes when it's night time? *Hint: It doesn't actually go anywhere* In this episode of Crash Course Kids, Sabrina talks about the Earth's rotation and revolution and how these things co
04:53 Popular
Following The Sun: Crash Course Kids #8.2

8 years ago / 1,938 views

Have you ever wondered why your shadow is longer sometimes and shorter others? It turns out it all has to do with that marvelous big ball of light in the sky; The Sun! This first series is based on 5th grade science. We're super excited and hope you enjoy
03:43 Popular
What On Earth: Crash Course Kids #10.1

8 years ago / 1,288 views

We've already talked about how the Earth is divided into four spheres (The Hydrosphere, the Biosphere, the Geosphere, and the Atmosphere). But, how do these different sphere interact with each other? In this episode of Crash Course Kids, Sabrina chats wit
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Weathering And Erosion: Crash Course Kids #10.2

8 years ago / 3,323 views

In this episode of Crash Course Kids, Sabrina gives us a real world example of how the Hydrosphere and Geosphere affect each other in the form of Weathering and Erosion. Think of Weathering as the force that makes a mess and Erosion as the force that clea
03:57 Popular
Seasons And The Sun: Crash Course Kids 11.1

8 years ago / 2,242 views

Updated with graphics fixed. Thanks for pointing that out! Ever wonder why we have seasons? A lot of people think it's because the Earth gets further away from the sun in winter, and closer in the summer. But, it's actually more interesting than that. In
03:33 Popular
Why No Polar Pineapples: Crash Course Kids #11.2

8 years ago / 1,071 views

Plants are amazing. Really! Photosynthesis is an incredible thing. But it also means that some plants can't live everywhere. They need to get the right amount of sunlight for the right amount of time. In this episode of Crash Course Kids, Sabrina chats ab
08:22
Fighting Malaria With Green Chemistry - Periodic Table Of Videos

8 years ago / 565 views

The Professor and his colleagues devise greener ways to produce the anti-Malaria drug Artemisinin. Artemisinin was first discovered in China. The main article: http://bit.ly/1FaQNci Additional info: http://bit.ly/Malaria_Supplementary This video features
05:14 Popular
How To Speak Monkey: The Language Of Cotton-top Tamarins - Anne Savage

8 years ago / 1,138 views

View full lesson: http://ed.ted.com/lessons/do-you-speak-monkey-the-language-of-cotton-top-tamarins-anne-savage The cotton-top tamarin is a very vocal monkey -- the species communicates using a sophisticated language of 38 distinct and grammatically struc
04:44 Popular
A Guide To The Energy Of The Earth - Joshua M. Sneideman

8 years ago / 1,627 views

View full lesson: http://ed.ted.com/lessons/a-guide-to-the-energy-of-the-earth-joshua-m-sneideman Energy is neither created nor destroyed — and yet the global demand for it continues to increase. But where does energy come from, and where does it go? Josh
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03:19 Popular
How Heavy Is Air? - Dan Quinn

8 years ago / 1,158 views

View full lesson: http://ed.ted.com/lessons/how-heavy-is-air-dan-quinn Too often we think of air as empty space — but compared to a vacuum, air is actually pretty heavy. So, just how heavy is it? And if it's so heavy, why doesn't it crush us? Dan Quinn de
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04:47 Popular
Inside The Ant Colony - Deborah M. Gordon

8 years ago / 845 views

View full lesson: http://ed.ted.com/lessons/inside-the-ant-colony-deborah-m-gordon Ants have one of the most complex social organizations in the animal kingdom; they live in structured colonies that contain different types of members who perform specific
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05:01 Popular
How Quantum Mechanics Explains Global Warming - Lieven Scheire

8 years ago / 1,557 views

View full lesson: http://ed.ted.com/lessons/how-quantum-mechanics-explains-global-warming-lieven-scheire You've probably heard that carbon dioxide is warming the Earth. But how exactly is it doing it? Lieven Scheire uses a rainbow, a light bulb and a bit
03:54 Popular
What Happens When You Get Heat Stroke? - Douglas J. Casa

8 years ago / 1,170 views

View full lesson: http://ed.ted.com/lessons/what-happens-when-you-get-heat-stroke-douglas-j-casa Have you ever suffered from exertional heat stroke? This condition is caused by intense activity in the heat and is one of the top three killers of athletes a
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04:47 Popular
What's Hidden Among The Tallest Trees On Earth? - Wendell Oshiro

8 years ago / 833 views

View full lesson: http://ed.ted.com/lessons/what-s-hidden-among-the-tallest-trees-on-earth-wendell-oshiro When Stephen Sillett was a boy, he took to the forests of Pennsylvania with his brother and grandmother. Looking up into the dense branches and leave
04:55 Popular
The Nurdles' Quest For Ocean Domination - Kim Preshoff

8 years ago / 824 views

View full lesson: http://ed.ted.com/lessons/the-nurdles-quest-for-ocean-domination-kim-preshoff Nurdles are the tiny, factory-made pellets that form the raw material for every plastic product that we use, from toys to toothbrushes. And while they look pre
04:12 Popular
How Do Tornadoes Form? - James Spann

8 years ago / 2,884 views

View full lesson: http://ed.ted.com/lessons/how-do-tornadoes-form-james-spann Tornadoes are the most violent storms on Earth, with wind velocities that can exceed 200 miles per hour. How do these terrifying cyclones form? Meteorologist James Spann sheds l
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04:35 Popular
What Causes Antibiotic Resistance? - Kevin Wu

8 years ago / 1,521 views

View full lesson: http://ed.ted.com/lessons/how-antibiotics-become-resistant-over-time-kevin-wu Right now, you are inhabited by trillions of microorganisms. Many of these bacteria are harmless (or even helpful!), but there are a few strains of ‘super bact
04:00 Popular
The Secret Lives Of Baby Fish - Amy McDermott

8 years ago / 850 views

View full lesson: http://ed.ted.com/lessons/the-secret-lives-of-baby-fish-amy-mcdermott Coral reef fish, like the yellow tang surgeonfish, begin life in a fascinating and weird way – as tiny floating larvae! These babies are capable of drifting thousands
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05:11 Popular
Feedback Loops: How Nature Gets Its Rhythms - Anje-Margriet Neutel

8 years ago / 1,849 views

View full lesson: http://ed.ted.com/lessons/feedback-loops-how-nature-gets-its-rhythms-anje-margriet-neutel While feedback loops are a bummer at band practice, they are essential in nature. What does nature’s feedback look like, and how does it build the
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The Past, Present And Future Of The Bubonic Plague - Sharon N. DeWitte

8 years ago / 754 views

View full lesson: http://ed.ted.com/lessons/the-past-present-and-future-of-the-bubonic-plague-sharon-n-dewitte The bubonic plague, which killed around 1/5 of the world’s population in the 14th century, is still around today -- but it now claims only a few
06:40 Popular
Cloudy Climate Change: How Clouds Affect Earth's Temperature - Jasper Kirkby

8 years ago / 725 views

View full lesson: http://ed.ted.com/lessons/cloudy-climate-change-how-clouds-affect-earth-s-temperature-jasper-kirkby As the Earth’s surface temperature gradually rises, it has become vital for us to predict the rate of this increase with as much precisio
03:38 Popular
Could Comets Be The Source Of Life On Earth? - Justin Dowd

8 years ago / 1,591 views

View full lesson: http://ed.ted.com/lessons/could-comets-be-the-source-of-life-on-earth-justin-dowd While comets were historically thought to be ill omens of war and famine, recent science has revealed that these celestial wonders actually contain amino a
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04:11
Is Our Climate Headed For A Mathematical Tipping Point? - Victor J. Donnay

8 years ago / 631 views

View full lesson: http://ed.ted.com/lessons/is-our-climate-headed-for-mathematical-chaos-victor-j-donnay Scientists have warned that as CO2 levels in the atmosphere rise an increase in Earth’s temperature by even two degrees could lead to catastrophic eff
05:54 Popular
How To Create Cleaner Coal - Emma Bryce

8 years ago / 792 views

View full lesson here: http://ed.ted.com/lessons/how-to-create-cleaner-coal-emma-bryce It takes a lot of fuel to heat our homes, preserve our food, and power our gadgets. And for 40 percent of the world, cheap, plentiful coal gets the job done. But coal a
04:27 Popular
The Hidden Worlds Within Natural History Museums - Joshua Drew

8 years ago / 900 views

View full lesson: http://ed.ted.com/lessons/the-hidden-worlds-within-natural-history-museums-joshua-drew When you think of natural history museums, you might picture exhibits filled with ancient lifeless things, like dinosaurs or meteorites. But behind th
03:59 Popular
Why The Arctic Is Climate Change's Canary In The Coal Mine - William Chapman

8 years ago / 969 views

View full lesson: http://ed.ted.com/lessons/why-the-arctic-is-climate-change-s-canary-in-the-coal-mine-william-chapman The Arctic may seem like a frozen and desolate environment where nothing ever changes. But the climate of this unique and remote region
09:15 Popular
What is Chemical Evolution?

8 years ago / 961 views

Have you ever wondered how life first got started on Earth? So do scientists! Though the question has not yet been fully answered, a careful study of Chemical Evolution is beginning to shed light on this mystery. In this film you will learn what Chemical
04:52 Popular
Why Do Buildings Fall In Earthquakes? - Vicki V. May

8 years ago / 1,456 views

View full lesson: http://ed.ted.com/lessons/why-do-buildings-fall-in-earthquakes-vicki-v-may Earthquakes have always been a terrifying phenomenon, and they’ve become more deadly as our cities have grown — with collapsing buildings posing one of the larges
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15:47 Popular
How Poachers Became Caretakers - John Kasaona

8 years ago / 933 views

View full lesson: http://ed.ted.com/lessons/how-poachers-became-caretakers-john-kasaona In his home of Namibia, John Kasaona is working on an innovative way to protect endangered animal species: giving nearby villagers (including former poachers) responsi
05:42 Popular
How We Think Complex Cells Evolved - Adam Jacobson

8 years ago / 844 views

View full lesson: http://ed.ted.com/lessons/how-we-think-complex-cells-evolved-adam-jacobson Imagine you swallowed a small bird and suddenly gained the ability to fly … or you ate a cobra and were able to spit poisonous venom! Well, throughout the history
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04:30 Popular
How Do Geckos Defy Gravity? - Eleanor Nelsen

8 years ago / 794 views

View full lesson: http://ed.ted.com/lessons/how-do-geckos-defy-gravity-eleanor-nelsen Geckos aren’t covered in adhesives or hooks or suction cups, and yet they can effortlessly scale vertical walls and hang from ceilings. What’s going on? Eleanor Nelsen e
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04:07 Popular
What Really Happens To The Plastic You Throw Away - Emma Bryce

8 years ago / 1,367 views

View full lesson: http://ed.ted.com/lessons/what-really-happens-to-the-plastic-you-throw-away-emma-bryce We’ve all been told that we should recycle plastic bottles and containers. But what actually happens to the plastic if we just throw it away? Emma Bry
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04:19 Popular
Why Is Biodiversity So Important? - Kim Preshoff

8 years ago / 1,452 views

View full lesson: http://ed.ted.com/lessons/why-is-biodiversity-so-important-kim-preshoff Our planet’s diverse, thriving ecosystems may seem like permanent fixtures, but they’re actually vulnerable to collapse. Jungles can become deserts, and reefs can be
05:02
Aurora Borealis Explained

8 years ago / 614 views

This video explains how particles originating from deep inside the core of the sun creates northern lights, also called aurora borealis, on our planet.See an extended multimedia version of this video at forskning.no (only in Norwegian):http://www.forsknin
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An Electric Eel And A Caiman

8 years ago / 728 views

Wherein Isobel and Maria show us the ropes -- or nets -- for surveying fishes in the Amazon. The distribution of fish in tropical river systems is important to understanding how animals move around these waterways. Where there are big fish -- like the ele
03:26
What Is Sea Level?

8 years ago / 600 views

FREE FACT: An oblate spheroid is a special case of an ellipsoid where two of the semi-principal axes are the same size. A special thanks to our Subbable.com supporters: Robby Weisenfeld Gustav Delius Ike https://www.youtube.com/TheNilFacts And to Audible.
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02:49
Evolution Vs Natural Selection

8 years ago / 569 views

This video was supported in part by http://www.audible.com/minutephysics Special thanks to Subbable.com supporters Jonathan Kwok and quantumrealityproject.blogspot.com for helping make MinutePhysics possible. http://www.subbable.com/minutephysics US Demog
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Wanda Sykes' 'Monkey Kingdom'

9 years ago / 597 views

Ellen showed a peek at the new documentary as narrated by the hilarious comedian.
08:23 Popular
Is Ultron Inevitable?

9 years ago / 821 views

Follow me to Vsauce3!! http://bit.ly/1zUxn7a Twitter: @okaytobesmart @jtotheizzoe Instagram: @jtotheizzoe↓ More info and sources below ↓ Will artificial intelligence ever surpass human intelligence? And if that happens, will AI be good or bad? Is evil AI
02:40 Popular
What Happens When Lava Meets Ice?

9 years ago / 743 views

When a team pours molten lava onto ice, the results are surprising. | For more Outrageous Acts of Science, visit http://science.discovery.com/tv-shows/outrageous-acts-of-science/#mkcpgn=ytsci1 Catch Outrageous Acts of Science Saturdays at 9/8c on Science!
06:10 Popular
The Oldest Living Things In The World

9 years ago / 722 views

Vote PBS Digital Studios for 'Best Science&Education Network' in the 2015 Webbys -- http://vid.io/xqjk ---- Subscribe to It's Okay To Be Smart: http://bit.ly/iotbs_sub↓ More info and sources below ↓ Follow on Twitter: http://twitter.com/jtotheizzoe Follow
04:51 Popular
What If There Were No Sharks?

9 years ago / 2,048 views

Vote PBS Digital Studios for 'Best Science&Education Network' in the 2015 Webbys -- http://vid.io/xqjk ---- Follow this link to more shark science videos by your favorite YouTubers!! http://bit.ly/1sugd0z↓ More info and sources below ↓ Follow on Twitter:
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03:11 Popular
Where Does The Smell Of Rain Come From?

9 years ago / 893 views

I smell a science storm a-comin'!! Subscribe to It’s Okay To Be Smart: http://bit.ly/iotbs_sub ↓ More info and sources below ↓ Follow on Twitter: http://twitter.com/jtotheizzoe Follow on Tumblr: http://www.itsokaytobesmart.com References: “Nature of Argil
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06:29 Popular
Why Do Clouds Stay Up?

9 years ago / 974 views

There’s nothing wrong with having your head in the clouds. Subscribe to It’s Okay To Be Smart: http://bit.ly/iotbs_sub ↓ More info and sources below ↓ Follow on Twitter: http://twitter.com/jtotheizzoe Follow on Tumblr: http://www.itsokaytobesmart.com Foll
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09:12 Popular
The Sixth Extinction

9 years ago / 802 views

This time, we’re the asteroid. Subscribe to It’s Okay To Be Smart: http://bit.ly/iotbs_sub ↓ More info and sources below ↓ Follow on Twitter: http://twitter.com/jtotheizzoe Follow on Tumblr: http://www.itsokaytobesmart.com Follow on Instagram: http://inst
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06:20
Climate Science: What You Need To Know

9 years ago / 645 views

Learn the basic science of climate change in 24 easy steps Subscribe to It’s Okay To Be Smart: http://bit.ly/iotbs_sub ↓ More info and sources below ↓ Follow on Twitter: http://twitter.com/jtotheizzoe Follow on Tumblr: http://www.itsokaytobesmart.com Foll
07:34 Popular
Why People Don't Believe In Climate Science

9 years ago / 794 views

Watch Part 1:“The Facts” http://youtu.be/ffjIyms1BX4 Subscribe to It’s Okay To Be Smart: http://bit.ly/iotbs_sub ↓ More info and sources below ↓ Follow on Twitter: http://twitter.com/jtotheizzoe Follow on Tumblr: http://www.itsokaytobesmart.com Follow on
11:39
The Ingenious Design of the Aluminum Beverage Can

9 years ago / 606 views

Bill details the engineering choices underlying the design of a beverage can He explains why it is cylindrical, outlines the manufacturing steps needed to created the can, notes why the can narrows near it lid, show close ups of the double-seam that hold
04:52 Popular
Should We Eat Bugs? - Emma Bryce

9 years ago / 948 views

View full lesson: http://ed.ted.com/lessons/should-we-eat-bugs-emma-bryce What's tasty, abundant and high in protein? Bugs! Although less common outside the tropics, entomophagy, the practice...
04:51 Popular
The Colossal Consequences Of Supervolcanoes - Alex Gendler

9 years ago / 847 views

View full lesson: http://ed.ted.com/lessons/the-colossal-consequences-of-supervolcanoes-alex-gendler In 1816, Europe and North America were plagued by heavy rains, odd-colored snow, famines,...
03:53 Popular
Where Did Earth’s Water Come From? - Zachary Metz

9 years ago / 978 views

View full lesson: http://ed.ted.com/lessons/where-did-earth-s-water-come-from-zachary-metz Water covers over 70% of the Earth, cycling from the oceans and rivers to the clouds and back again....
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02:41 Popular
Raining Fish In London | World's Strangest

9 years ago / 897 views

You've heard the expression "it's raining cats and dogs," but once it literally rained fish in England. What's the true story? | For more World's Strangest, visit http://www.sciencechannel.com/tv-shows/worlds-strangest/#mkcpgn=ytsci1 Catch World's Strange
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03:18 Popular
Algae Fuel Could Change the World | World's Strangest

9 years ago / 778 views

This literally green technology could completely revolutionize the transportation industry. | For more World's Strangest, visit http://www.sciencechannel.com/tv-shows/worlds-strangest/#mkcpgn=ytsci1 Catch World's Strangest Tuesdays at 8/7c on Science Chan
03:17
Smithsonian National Zoo (webisode)

9 years ago / 624 views

A brief look at Great Museums' episode featuring the Smithsonian National Zoo and its efforts to save endangered species of our planet, which aired on Public Television in Fall 2008. Click on http://greatmuseums.org for more information.
56:43 Popular
Wild Thing: The Smithsonian National Zoo

9 years ago / 949 views

As part of its mission to "advance research and scientific knowledge in conserving wildlife and to teach and inspire people to protect wildlife, natural resources, and habitats," scientists at the National Zoo breed endangered species for the purpose of r
10:30 Popular
Drought and Famine: Crash Course World History #208

9 years ago / 1,213 views

In which John Green teaches you a little bit about drought, which is a natural weather phenomenon, and famine, which is almost always the result of human activity. Throughout human history, when food shortages strike humanity, there was food around. There
10:08 Popular
Climate Change, Chaos, and The Little Ice Age - Crash Course World History 206

9 years ago / 1,145 views

In which John Green teaches you about the Little Ice Age. The Little Ice Age was a period of global cooling that occurred from the 13th to the 19th centuries. This cooling was likely caused by a number of factors, including unusual solar activity and volc
11:37 Popular
Disease! Crash Course World History 203

9 years ago / 976 views

In which John Green teaches you about disease, and the effects that disease has had in human history. Disease has been with man since the beginning, and it has shaped the way humans operate in a lot of ways. John will teach you about the Black Death, the
12:20
The Anthropocene and the Near Future: Crash Course Big History #9

9 years ago / 685 views

In which John Green, Hank Green, and Emily Graslie teach you about the Anthropocene, an unofficial geological era that covers the last century or so, in which humanity has made massive progress. We've discovered the Higgs-Boson particle, and awesome elect
13:58 Popular
The Modern Revolution: Crash Course Big History #8

9 years ago / 811 views

In which Hank and John Green teach you a Crash Course on the modern revolution, and the upside of the progress that humanity has made in the last 500 years or so. And while there are two sides to every history, and many of these changes haven't been great
13:41 Popular
Migrations and Intensification: Crash Course Big History #7

9 years ago / 1,030 views

In which Hank and John Green teach you about humanity conquering the Earth. Or at least moving from Africa into the rest of the Earth. As human beings spread out across the world and populations grew, humanity reached a critical mass of innovators, and co
16:14 Popular
Human Evolution: Crash Course Big History #6

9 years ago / 1,001 views

In which John Green and Hank Green teach you about how human primates moved out of Africa and turned Earth into a real-life Planet of the Apes. And the apes are people! John and Hank teach you about how humans evolved, and the sort of tricks they picked u
15:05 Popular
The Evolutionary Epic: Crash Course Big History #5

9 years ago / 997 views

In which John Green, Hank Green, and Emily Graslie teach you about evolution. So, in the last 3.8 billion years, life on Earth has evolved from single-celled prokaryotes to the dizzying array of life we have today. So how did all this happen? We'll talk a
13:29 Popular
Life Begins: Crash Course Big History #4

9 years ago / 879 views

In which Hank and John Green teach you about life on Earth. They won't be giving advice on how life should be lived, because this is a history series. Instead, they'll teach you about the earliest forms of life on Earth, and some of the ways that they dev
14:33 Popular
The Sun&The Earth: Crash Course Big History #3

9 years ago / 939 views

In which John Green, Hank Green, and Emily Graslie teach you about our Sun, and the formation of the planets. We're going to focus on the formation and development of the Earth, because that's where people live. You'll learn about the Solar nebula, the bi
14:37 Popular
Exploring the Universe: Crash Course Big History #2

9 years ago / 713 views

In which John Green, Hank Green, and Emily Graslie teach you about what happened in the Universe after the big bang. They'll teach you about cosmic background radiation, how a bunch of hydrogen and helium turned into stars, formed galaxies, created heavy
14:25 Popular
The Big Bang: Crash Course Big History #1

9 years ago / 1,184 views

In which John Green, Hank Green, and Emily Graslie teach you about, well, everything. Big History is the history of everything. We're going to start with the Big Bang, take you right through all of history (recorded and otherwise), and even talk a little
13:41
Energy Inputs for Tilling a Hectare of Land

9 years ago / 551 views

Thinking about energy consumption for tilling land More free lessons at: http://www.khanacademy.org/video?v=5I9dH5im24U
13:00 Popular
Land Productivity Limiting Human Population

9 years ago / 774 views

Thinking about how we get Calories from the land limits human population densities More free lessons at: http://www.khanacademy.org/video?v=xM8szz4VB28
04:39
Seasons Aren't Dictated by Closeness to Sun

9 years ago / 543 views

Why our closeness to the sun does not dictate the seasons More free lessons at: http://www.khanacademy.org/video?v=SJUd5du0T08
07:17 Popular
Are Southern Hemisphere Seasons More Severe?

9 years ago / 811 views

Are Southern Hemisphere seasons more severe because of the eccentricity in Earth's orbit? More free lessons at: http://www.khanacademy.org/video?v=umvNQj-zmq4
13:19 Popular
Plate Tectonics -- Evidence of plate movement

9 years ago / 1,927 views

Plate Tectonics -- Evidence of plate movement More free lessons at: http://www.khanacademy.org/video?v=6EdsBabSZ4g
10:08 Popular
Earth Formation

9 years ago / 722 views

How the Earth is a the byproduct of a local supernova More free lessons at: http://www.khanacademy.org/video?v=VbNXh0GaLYo
06:38
Firestick Farming

9 years ago / 648 views

How the indigenous Australians used fire to change their environment More free lessons at: http://www.khanacademy.org/video?v=mwUyaeWxJhA