Did you know whales evolved from dog-sized land animals? Meet Pakicetus, the ancestor that started it all.

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Your teeth might still carry the legacy of nuclear fallout. The story of radioactive baby teeth is a chilling reminder of the dangers of nuclear warfare.

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What if continents and oceans switched places? The Pacific becomes a supercontinent. Earth's deepest point is Everest Deep, and is almost nine kilometers below sea-level. And the Mid-Atlantic Canyon divides the world from pole to pole. Life finds a way but struggles in this new, upside-down, inverted world. This all sounds cool, until the oxygen runs out...

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We got a bird flu simulator before GTA 6... 🐔

But seriously – why does bird flu spread so quickly and why is it so difficult to contain its spread? Let's look at it together.

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Spacesuits are high-tech lifesavers in space. But when they break, things get deadly fast. Discover the science behind what keeps astronauts alive.

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Imagine solving a rabies outbreak with chicken heads.

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The human body is surprisingly resilient. From kidneys and spleens to chunks of your liver and even part of your blood.
Which organs can you safely lose? What happens when you do?
And how can science sometimes step in to replace the irreplaceable?

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Ever wonder why you can’t recall memories from your early years? Turns out, your brain rewires itself so fast it erases your earliest memories – and that’s a good thing.

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When a grape is cut nearly in half and placed in a microwave, plasma is produced. Please use caution if attempting this experiment: don't leave the microwave on for too long, make sure the area is well ventilated, and stand back. Remember the contents will be very hot afterwards.

Innovative research conducted in Lausanne, Switzerland has shown that a combination of neurotransmitters and electrical stimulation can restore movement to the lower limbs of previously paralysed rats. But in order for this motion to be made voluntarily the rats must be motivated to walk. This motivation comes in the form of cheering, visual cues, and of course, chocolate.

Why Trees Are Amazing: http://bit.ly/TFilQ8
Space Junk: http://bit.ly/XlLdjG
Why Astronauts Are Weightless: http://bit.ly/SuF2p1
Higgs Boson Update: http://bit.ly/Vw1Sgu

Robots of the future may be softer, squishier and bendier than robots today. This could make them ideal for space exploration. Check out http://kiwico.com/Veritasium50 for 50% off your first month of any subscription!

On Thursday February 18th, 2021 the NASA Perseverance Rover will land on Mars. It is a wonderful robot, made out of steel and wire — but will future robots look like Perseverance? There is an emerging field of research on "soft robots", where the machines are flexible. These soft robots have many advantages over traditional robots — they're safer, lighter, more flexible and can change their shape and size.

NASA is investigating the use of soft robots for space missions. For future visits to Enceladus or Europa, a lander could cut a hole in the ice and then insert a compliant robot through the hole. This robot could then grow and change shape on the other side.

References:
N. S. Usevitch, Z. M. Hammond, M. Schwager, A. M. Okamura, E. W. Hawkes, S. Follmer, An untethered isoperimetric soft robot. Sci. Robot. 4,
https://ve42.co/Hammond2020 — paper about the truss robot

https://ve42.co/Usevitch2020 — press release and video about the truss robot

Electronics-free pneumatic circuits for controlling soft-legged robots
Dylan Drotman1, Saurabh Jadhav, David Sharp, Christian Chan, Michael T. Tolley Sci. Robot. 6, eaay2627 (2021)
https://ve42.co/Drotman — paper about the turtle robot

Special thanks to Patreon supporters:
Jim Osmun, Tyson McDowell, Ludovic Robillard, jim buckmaster, Robert, fanime96, Marc Forand, Juan Benet, Ruslan Khroma, Robert Blum, Grace O'Maille KRON x Arc iOS, Richard Sundvall, Lee Redden, Vincent, Lyvann Ferrusca, Alfred Wallace, Arjun Chakroborty, Joar Wandborg, Clayton Greenwell, Pindex , Michael Krugman, Cy 'kkm' K'Nelson, Sam Lutfi, Ron Neal, Bryan Baker

Video supplied by Getty Images

Thanks to Zachary Hammond for showing me the soft truss robot
Filmed by Derek Muller
Edited and GFX by Trenton Oliver
Animation by Ivy Tello
Music by Jonny Hyman
Thumbnail by Ignat Berbeci, Dan Meyer

Everything is not as it first appears. This simple plastic ball looks purple until you swing it in a circle and reveal its true nature. Inside are three light emitting diodes (LEDs), which are red, green and blue. They turn on and off in sequence very quickly. When still, the ball appears purple because your eyes and brain don't 'refresh' quickly enough to perceive the changing colours. However, when swung in a circle, the ball changes colours at different locations so the colours don't merge with each other and the ball's true nature is revealed. Now let's not think too carefully about how this illusion is conveyed through video (because the camera doesn't refresh quickly enough to perceive the colours changing either - so you have no hope of seeing it on YouTube even frame by frame).

Or almost any garage - it's particularly good with fixed code gates and garages. Samy proposes other weaknesses with rolling codes.
This video was sponsored by LastPass: http://bit.ly/2oscAe9

I don't condone malicious hacking of gates, garages or other property. The point of this video was to discuss how it could be done using fairly basic technology like this toy that was originally intended as an instant messaging device. I learned a lot in making this video about how codes are sent and received, how they are encrypted or not encrypted. I found out how hard it is to execute in practice something which in principle doesn't seem that difficult.

Special thanks to Samy! His original videos on using the IM ME to open radio frequency garages and gates can be found here: https://www.youtube.com/user/s4myk
He's got a really cool channel so be sure to subscribe if you're interested in this stuff.

Music from http://epidemicsound.com "Critical thinking 2" "I think I was there" "Magnified X 3"

And music by Kevin MacLeod http://incompetech.com "Marty Gots a Plan"

We also made a video about laser cooling! http://bit.ly/PhysGirl
Check out Audible: http://bit.ly/AudibleVe
Check out Beyond Slow Motion: http://bit.ly/VeBeyondSlowMo
More on this topic: http://wke.lt/w/s/ef3eV

Special thanks to Laser Away in Santa Monica for helping make this happen - your staff was awesome! http://bit.ly/VeLaserAway

Research and filming by Raquel Nuno and Aaron White.

This was a pretty extraordinary experience - thanks to NASA for inviting me! The Atlas V 541 rocket took off carrying the Perseverance rover and Ingenuity the Mars helicopter at 7:50 am July 30, 2020. They should arrive in about seven months on February 18, 2021

Thumbnail by Fictionalhead https://www.youtube.com/fictionalhead

Thank you to Rodney Fox for sharing his story. He was attacked by a shark 50 years ago - Dec. 8 1963. If you're interested in his book or in going shark cage diving in South Australia, check out: http://bit.ly/rodneyfox

Right: https://www.youtube.com/watch?v=AS9OXzSRBMQ
Left: http://www.youtube.com/watch?v=FWQ-HJ4oGKQ
It Depends: https://www.youtube.com/watch?v=R3GHiMOHEy8
What happens when nylon rope is wound around a spool and pulled horizontally to the right? Will the spool go to the right, to the left, or does it depend on how the rope is pulled?

Grant Thompson - the King of Random - teaches me how to start a fire with a Sandwich bag. And we tried to melt glass in my backyard: https://goo.gl/zb0uE0
Check out his channel: http://ve42.co/KoR

The intensity of sunlight on Earth is about 1300 Watts per square meter. When you focus the sun's rays using a magnifying glass (or in this case sphere of water) you can increase the intensity roughly ten thousand fold. This increases the temperature of wood to its autoignition point starting the reaction with oxygen in the atmosphere. By protecting the hot embers and adding more energy and fuel, you can get these hot coals to start a roaring fire.

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Rodney Fox Shark Attack Story: http://bit.ly/1frAwlI
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For this video I went off the coast of South Australia to an island frequented by great white sharks. Here they hunt seals and fish. I've never been scuba diving before but I got into a cage and filmed the sharks under water. It was an incredible experience. Then we came back on the surface to tag the sharks.

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Everyone has played with a mixture of corn starch and water (or at least I hope they have). This was one of my favorite experiments as a kid. Your hand slides into the slime easily when moving slowly but the mixture behaves as a solid if you hit it quickly. That is what is meant by 'non-Newtonian' - the fluid's properties change depending on its relative motion. These properties can be exploited to dramatic effect as has been shown on speaker cones before. Here I wanted to understand what is going on, what frequencies and amplitudes work best so I used a slow-mo camera.

Thanks to everyone at the YouTube Space LA for helping me film this. I couldn't have done it without you.

Music licensed from http://www.cuesongs.com
Love Lost (Instrumental) by Temper Trap
A Life in the Day by Ghost of Otis
Fortune's Fool Instrumental by Hiatus & Shura
The Man by Audio Android