TED-Ed

Dig into the science of stretching, and find out what it actually does to your muscles and how you can improve your flexibility.

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An athlete is preparing for a game. They’ve put on their gear and done their warmup, and now it’s time for one more routine — stretching. Typically, athletes stretch before physical activity to avoid injuries like strains and tears. But does stretching actually prevent these issues? And if so, how long do the benefits of stretching last? Malachy McHugh explores the finer points of flexibility.

Lesson by Malachy McHugh, directed by Sofia Pashaei.

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View full lesson: https://ed.ted.com/lessons/how-stretching-actually-changes-your-muscles-malachy-mchugh
Dig deeper with additional resources: https://ed.ted.com/lessons/how-stretching-actually-changes-your-muscles-malachy-mchugh#digdeeper

Music: https://www.campstudio.co
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View full lesson: http://ed.ted.com/lessons/can-we-eat-to-starve-cancer-william-li

Uploaded 08-04-14

William Li presents a new way to think about treating cancer and other diseases: anti-angiogenesis, preventing the growth of blood vessels that feed a tumor. The crucial first (and best) step: Eating cancer-fighting foods that cut off the supply lines and beat cancer at its own game.

Talk by WIlliam Li.



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View full lesson: http://ed.ted.com/lessons/the-evolution-of-the-human-eye-joshua-harvey

Uploaded 08-01-15

The human eye is an amazing mechanism, able to detect anywhere from a few photons to a few quadrillion, or switch focus from the screen in front of you to the distant horizon in a third of a second. How did these complex structures evolve? Joshua Harvey details the 500 million year story of the human eye.

Lesson by Joshua Harvey, animation by Artrake Studio.



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2011 was a year of extraordinary people-powered resistance, starting with Arab Spring and spreading across the world. How did this resistance work so well? Srdja Popovic (who led the nonviolent movement that took down Milosevic in Serbia in 2000) lays out the plans, skills and tools each movement needs -- from nonviolent tactics to a sense of humor. (Filmed at TEDxKrakow.)

Uploaded 15-08-13

Talk by Srdja Popovic.



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View full lesson: http://ed.ted.com/lessons/dark-matter-the-matter-we-can-t-see-james-gillies

The Greeks had a simple and elegant formula for the universe: just earth, fire, wind, and water. Turns out there's more to it than that -- a lot more. Visible matter (and that goes beyond the four Greek elements) comprises only 4% of the universe. CERN scientist James Gillies tells us what accounts for the remaining 96% (dark matter and dark energy) and how we might go about detecting it.

Lesson by James Gillies, animation by TED-Ed.

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View full lesson: http://ed.ted.com/lessons/mysteries-of-vernacular-tuxedo-jessica-oreck

How did tuxedo's roots extend from Native American history to black tie evening wear? Jessica Oreck reveals what the Delaware Indians and formal fashion have in common.

Lesson by Jessica Oreck and Rachael Teel, animation by Jessica Oreck.

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Explore why migration is so taxing and dangerous for birds, and what ways we can help birds on their journey.

Uploaded 17-09-13

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Nearly 200 species of songbirds migrate south for winter, some traveling up to 7,000 miles. No easy task, the annual journey is dangerous to birds due to landscape change -- so much so, that only half the birds that migrate south will return home for spring. Alyssa Klavans details why bird migration is so taxing and how we can assist our chirping friends.

Lesson by Alyssa Klavans, animation by Igor Coric.

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View full lesson: http://ed.ted.com/lessons/bird-migration-a-perilous-journey-alyssa-klavans



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Uploaded 16-08-18

View full lesson: https://ed.ted.com/lessons/zen-koans-unsolvable-enigmas-designed-to-break-your-brain-puqun-li

How do we explain the unexplainable? This question has inspired numerous myths, religious practices and scientific inquiries. But Zen Buddhists practicing throughout China from the 9th to 13th century asked a different question – why do we need an explanation? Puqun Li details the bewildering and ambiguous philosophical thought experiments these Buddhists called Zen kōans.

Lesson by Puqun Li, directed by Cabong Studios.

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Examine the ethical stance known as longtermism, which is the idea that we should be doing more to protect future generations.

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Imagine that your life began as one of the planet’s first humans. After dying, you're reincarnated as the second human ever to live. You then return as the third person, the fourth, the fifth, and so on – living the lives of every human that’s ever walked the Earth. How will your actions in one life impact your future selves? Explore the ethics of the philosophy known as longtermism.

Directed by Jay Septimo, Khoo Siew May, AIM Creative Studios.

Learn more about the long-term thinking required for humanity to thrive: https://ed.ted.com/everyhumanlife

This video made possible in collaboration with the Forethought Foundation
Learn more about how TED-Ed partnerships work: https://bit.ly/TEDEdPartners

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View full lesson: https://ed.ted.com/lessons/what-if-you-experienced-every-human-life
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Animator's website: https://aimcreativestudios.com
Music: https://soundcloud.com/aim-music
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Bioethicist Paul Root Wolpe describes an astonishing series of recent bio-engineering experiments, from glowing dogs to mice that grow human ears. He asks: Isn't it time to set some ground rules? (Filmed at TEDxPeachtree.)

Uploaded 15-08-13

Talk by Paul Root Wolpe.



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