On the surface of Earth all objects accelerate downwards at the same rate - at least, they're supposed to. But we all know dust, pieces of paper, and feathers fall slower. This is of course due to the influence of air resistance. In this experiment we use an evacuated cylinder to test whether a coin and feather really do accelerate at the same rate.

Scientists have recently discovered nanodiamonds in the flames of ordinary candles. They are produced at a rate of about 1.5 million per second. Unfortunately they are also burned up at this rate and released into the atmosphere as carbon dioxide. Still this finding may prove useful in the ongoing search for economical ways to produce diamonds.

Breath-taking images of a wolf chasing and capturing a caribou in the wild. Brilliant images from BBC natural history masterpiece, Planet Earth. Visit http://www.bbcearth.com for all the latest animal news and wildlife videos and watch more high quality videos on the new BBC Earth YouTube channel here: http://www.youtube.com/bbcearth

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New on Earth: https://bit.ly/2M3La96
Oceanscapes: https://bit.ly/2Hmd2kZ
Wild Thailand: https://bit.ly/2kR7lmh

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Want to help plant 20M trees by 2020? Go to https://teamtrees.org #teamtrees
Huge thanks to all the YouTubers who organized this. My apologies for the repost.
These videos are from 2012 so my interest in trees goes back a long ways. I think these videos discuss two of the most interesting and amazing facts about our leafy friends: they are made mostly of CO2 (which comes from us breathing out amongst other sources) and they can transport water up a tube higher than any we can currently manufacture. So trees are out to get you. But we do much worse to them so we owe it to them to plant some more. 20 mil is a good start.

The strange thing about high jump is that the technique changed dramatically after 1968, when Dick Fosbury used his trademark flop to win the gold medal at the Olympics in Mexico City.
Previously the scissors and straddle had been the most common jumping technique, but after the introduction of safer landing matts, the new unorthodox Fosbury Flop became the jump of choice. There are good physical reasons for this - the style allows the jumper to pass over the bar while his or her centre of mass actually passes below the bar.

Huge thanks to Elly (Appchat http://bit.ly/NxAMlX ) for filming, editing, and music!

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A story is worth a thousand data points.
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More info on this topic: http://wke.lt/w/s/TzNC0

Never before have humans journeyed to the Antarctic deep sea. Scientist Dr Jon Copley reveals what it’s like to travel 1000m beneath the ice. Subscribe to BBC Earth for more amazing animal videos - http://bit.ly/BBCEarthSub

#OurBluePlanet is a digital project between BBC Earth and Alucia Productions. Join the conversation over on Twitter @OurBluePlanet. This film was produced by Alucia Productions. You can find out more about Alucia on their website https://aluciaproductions.com/

Production Crew:
Director: Mark Dalio
Director of Photography (AP): Janssen Powers
Director of Photography (BBC): Ted Giffords
2nd Camera: James DuBourdieu
Field Audio: Mike Kassic
Production Manager: Samantha Loshiavo
Associate Producer: Marjorie Crowley
Editor: Janssen Powers
Colorist: Ryan Quinn
Re-Recording Mixer (honeymix): Eric Thompson
Assistant Editor: Jorge Alverez
Post Production Supervisor: Brian Golding
Executive Producer: Jennifer Hile


Watch more videos from BBC Earth
Planet Earth http://bit.ly/PlanetEarthPlaylist
Blue Planet http://bit.ly/BluePlanetPlaylist
Planet Earth II http://bit.ly/PlanetEarthIIPlaylist
Planet Dinosaur http://bit.ly/PlanetDinoPlaylist

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About BBC Earth
The world is an amazing place full of stories, beauty and natural wonder. Jump in to BBC Earth's YouTube channel and meet your planet. You'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history content on here. Dramatic, rare, and exclusive, nature doesn't get more exciting than this. Subscribe to be the first to view new videos. And you can become part of the BBC community by checking out our BBC Earth Facebook page. Here you'll find the best natural history content from the web, exclusive videos and images and a thriving, vibrant community. This is a channel from BBC Worldwide who help fund new BBC programmes Service information and feedback: http://bbcworldwide.com/vod-fe....edback--contact-deta


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Deers look out for each other in groups, but a lone baby deer is not match for a hungry tiger.
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Natural World: Return of The Tiger
Five years ago the tigers of Sariska Reserve, India, were completely wiped out by poachers. This beautiful film follows a female tiger and a hot-blooded male over 18 months as they try to establish their new territory, learn to hunt their prey and dodge the ever-present threat of poachers.

Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this.

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Lemurs are native only to Madagascar, and the indri is the biggest of them all. Narrated by Sir David Attenborough.

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New research shows chameleons actively tune nano-crystals to change their color.
For a 10-day free trial, check out http://lynda.com/veritasium
Chameleon research in Nature Communications: http://bit.ly/1FacHO2
"Photonic Crystals Cause Active Colour Change in Chameleons"

This research was carried out by Jérémie Teyssier, Suzanne V. Saenko, Dirk van der Marel & Michel C. Milinkovitch at the University of Geneva Department of Quantum Matter Physics and the Laboratory of Artificial and Natural Evolution (LANE)

Original videos of chameleons are here:
https://www.youtube.com/watch?v=YIRiCwHlUd8
https://www.youtube.com/watch?v=XdQvtP8EKrM
https://www.youtube.com/watch?v=YSH7EmXFMac
https://www.youtube.com/watch?v=egwueh6wj1E

Additional details available at: http://www.lanevol.org/LANE/ch....ameleon_colour_chang
For correspondence: Michel C. Milinkovitch, Laboratory of Artificial & Natural Evolution (LANE), Dept. of Genetics & Evolution, University of Geneva, Switzerland.

The melanin spreading out video is courtesy of Richard Wheeler:
https://www.youtube.com/watch?v=hL0USeWjTHQ
http://www.richardwheeler.net

Special thanks to:
Harry, Jo, Daniella and Raquel for helping me produce and film this video - it looks great thanks to you!

Complete unedited interviews: http://www.youtube.com/watch?v=8dcw98B2Nzg
Trees can weigh hundreds or even thousands of tons, but where do they get this mass from? A few common answers are: the soil, water, and sunlight. But the truth is the vast majority of a dry tree's mass comes from the air - it originated as carbon dioxide

An exiled leopard daughter needs to learn to hunt for herself.
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Natural World: Fishing Leopards
David Attenborough narrates the intimate story of a leopard mother and her two cubs. This family must survive in the wilds of Botswana alongside some less-than-friendly neighbours: lions, wild dogs and hyenas. The competition for food is tough, and if they are going to make it they must learn a new skill - they must learn to fish.

Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history content.

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After her male companion is killed by a villager, a female tiger looks for him for days.
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Natural World: Return of the Tiger
Five years ago the tigers of Sariska Reserve, India, were completely wiped out by poachers. It was a huge setback in the war to save this treasured species from extinction - but now conservationists are fighting back. This beautiful film follows a female tiger and a hot-blooded male over 18 months as they try to establish their new territory, learn to hunt their prey and dodge the ever-present threat of poachers.

Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this.

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Chaos theory means deterministic systems can be unpredictable. Thanks to LastPass for sponsoring this video. Click here to start using LastPass: https://ve42.co/VeLP
Animations by Prof. Robert Ghrist: https://ve42.co/Ghrist

Want to know more about chaos theory and non-linear dynamical systems? Check out: https://ve42.co/chaos-math

Butterfly footage courtesy of Phil Torres and The Jungle Diaries: https://ve42.co/monarch
Solar system, 3-body and printout animations by Jonny Hyman
Some animations made with Universe Sandbox: https://universesandbox.com/
Special thanks to Prof. Mason Porter at UCLA who I interviewed for this video.

I have long wanted to make a video about chaos, ever since reading James Gleick's fantastic book, Chaos. I hope this video gives an idea of phase space - a picture of dynamical systems in which each point completely represents the state of the system. For a pendulum, phase space is only 2-dimensional and you can get orbits (in the case of an undamped pendulum) or an inward spiral (in the case of a pendulum with friction). For the Lorenz equations we need three dimensions to show the phase space. The attractor you find for these equations is said to be strange and chaotic because there is no loop, only infinite curves that never intersect. This explains why the motion is so unpredictable - two different initial conditions that are very close together can end up arbitrarily far apart.

Music from https://epidemicsound.com "The Longest Rest" "A Sound Foundation" "Seaweed"

The pride are on the move, but Cumay the lion cub struggles to keep up. Later Father Baba shows his son how to roar.

Find out more about this great children's show here: http://www.bbc.co.uk/cbeebies/....grownups/shows/littl

Little Big Cat
The intimate and endearing stories of lion, leopard and cheetah cubs living in the Masai Mara in Kenya. Adapted from the Big Cat series, Little Big Cat brings all the drama and charm to a younger audience.

Little Big Cat tells the stories through the eyes of the lion, leopard and cheetah cubs living in the Masai Mara in Kenya. The show uses a friendly story teller to set the scene and introduce the subject of each particular show while the cubs are voiced by young African children.


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Every summer, manatees gather in their thousands in Florida. A leading cause of manatee death here is from boat strike. Can regulations save these gentle giants?
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Watch more:
Planet Earth http://bit.ly/PlanetEarthPlaylist
Blue Planet http://bit.ly/BluePlanetPlaylist
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Planet Dinosaur http://bit.ly/PlanetDinoPlaylist

Conservation Short from Seven Worlds, One Planet Episode 6, 'North America'

Millions of years ago incredible forces ripped apart the Earth’s crust creating seven extraordinary continents. Seven Worlds, One Planet, narrated by Sir David Attenborough, will reveal how each distinct continent has shaped the unique animal life found there.

Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of entertaining and thought-provoking natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this.

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The kilogram, mole, kelvin, and ampere will be redefined by physical constants. For a limited time, get 3 months of Audible for just $6.95 a month: http://audible.com/VERITASIUM or text VERITASIUM to 500500

Will this be the last video I make about SI units? Quite possibly. There's something about being so precise and defining the systems within which science works. When we can more accurately and routinely measure a kilogram, a mole, a kelvin and an ampere, then we can make better observations, we can better detect anomalies and improve our theories. That is why this is so important to me.

Special thanks to Patreon supporters:
Donal Botkin, Michael Krugman, Ron Neal, Nathan Hansen, James M Nicholson, Terrance Shepherd, Stan Presolski

Special thanks to NIST: http://nist.gov

Additional graphics by Ignat Berbeci

Music from http://epidemicsound.com "Experimental1"

Preview of the next episode of Dynasties: When honey badgers get their eyes on some newborn puppies, Tait the painted wolf and her daughter need to collaborate to save them from danger. Narrated by David Attenborough.
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Planet Dinosaur http://bit.ly/PlanetDinoPlaylist

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Dynasties
Enter a world of dynastic power struggles and family treachery that’s more dramatic than any work of fiction. Filmed over four years in glorious locations around the globe, this intimate landmark series pulls viewers into the lives of some of the world's most iconic animals. As their stories unfold, you witness their incredible determination to protect their family line in the face of challenges to their leadership or from the often harsh environment around them. This stunningly shot series explores the complex relationships of these characters and shows the teamwork it takes to hold onto their territories. It immerses the audience in every poignant moment and heart-wrenching betrayal as they strive to create dynasties to rule for generations.

Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this.

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In a fantastic clip from Attenborough's 1993 series Life in the Freezer, Sir David demonstrates how inquistive baby penguins are. A great glimpse into the life of king penguins and their parental instincts.

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WATCH MORE:
New on Earth: https://bit.ly/2M3La96
Oceanscapes: https://bit.ly/2Hmd2kZ
Wild Thailand: https://bit.ly/2kR7lmh

Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history content.

Want to share your views with the team behind BBC Earth and win prizes? Join our BBC Studios Voice: https://www.bbcstudiosvoice.com/register

This is a channel from BBC Worldwide who help fund new BBC programmes. Service information and feedback: http://bbcworldwide.com/vod-fe....edback--contact-deta

A starving wolf pack swims through the lake to find some prey. Will Storm find food for his pups in time?

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Watch more videos from BBC Earth:
Planet Earth http://bit.ly/PlanetEarthPlaylist
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Natural World: A Wolf Called Storm

Storm is an extraordinary wolf - the head of a pack in Canada's frozen north that hunts the giant buffalo herds. This pack came to fame in Frozen Planet, and now cameraman Jeff Turner spends a year with Storm and his wolf family, learning how they survive in this harsh wilderness and whether Storm can pass his hunting skills on to the new generation of wolf cubs.

Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this.

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