TED-Ed

Discover how scientists and doctors used bats' ultrasound capabilities as inspiration for SONAR and non-invasive medical procedures.

Uploaded 01-04-21

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In a dark cave, bats can’t see much. But even with their eyes shut, they can navigate rocky topography at incredible speeds. This is because bats aren't just guided by their eyes, but rather, by their ears. It may seem impossible to see with sound, but bats, naval officers, and doctors do it all the time. How is that possible? Jacques S. Abramowicz digs into the unique properties of ultrasound.

Lesson by Jacques S. Abramowicz, directed by Sofia Pashaei.

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View full lesson: https://ed.ted.com/lessons/how-does-ultrasound-work-jacques-s-abramowicz
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Animator's website: https://www.sofiapashaei.com/
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New videography techniques have opened up the oceans' microscopic ecosystem, revealing it to be both mesmerizingly beautiful and astoundingly complex. Marine biologist Tierney Thys has used footage from a pioneering project to create a film designed to ignite wonder and curiosity about this hidden world that underpins our own food chain.

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At TEDYouth 2011, Performance artist Carvens Lissaint shows how to use language, metaphor and imagery to express a powerful idea -- as in this spoken word performance, a stirring plea to make college education more accessible.

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At TEDMED, Sheila Nirenberg shows a bold way to create sight in people with certain kinds of blindness: by hooking into the optic nerve and sending signals from a camera direct to the brain.

Uploaded 26-07-13

Talk by Sheila Nirenberg.



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Modern medicine is in danger of losing a powerful, old-fashioned tool: human touch. Physician and writer Abraham Verghese describes our strange new world where patients are merely data points, and calls for a return to the traditional one-on-one physical exam.

Uploaded 16-08-13

Talk by Abraham Verghese.



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View full lesson: http://ed.ted.com/lessons/the-silk-road-history-s-first-world-wide-web-shannon-harris-castelo

Uploaded 03-06-14

With modern technology, a global exchange of goods and ideas can happen at the click of a button. But what about 2,000 years ago? Shannon Harris Castelo unfolds the history of the 5,000-mile Silk Road, a network of multiple routes that used the common language of commerce to connect the world's major settlements, thread by thread.

Lesson by Shannon Harris Castelo, animation by Steff Lee.



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Dig into what biological factors influence hair growth, how it can change as you age, and how to take control of your scalp.

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At age 44, Xie Qiuping cut her hair for the first time in over three decades. Her impressive locks extended over 5 meters — earning the Guinness World Record for the world’s longest hair. But even with this record-setting feat, her hair might not have reached its maximum possible length. So, just how long can human hair actually grow? Maksim Plikus digs into what factors influence hair growth.

Lesson by Maksim Plikus, directed by Matt Partridge.

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Animator's website: https://www.mattpartridgeanimation.com
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Dig into the pros and cons of annuity and lump sum lottery payouts, and find out the most common mistakes lottery winners make.

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After winning the lottery, one of the first decisions you’d have to make is how you want your winnings to be paid out. You can choose the full jackpot amount, paid out in annual installments over 30 years. Or you can take a much smaller lump sum paid out immediately. So, which is the better option? Explore the financial implications of annuity and lump sum payments.

Directed by Anton Bogaty.

This video made possible in collaboration with Gifted Savings
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Animator's website: https://antonbogaty.com
Music: https://www.workplaywork.com
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Download a free audiobook version of "Devil in the White City" and support TED-Ed's nonprofit mission: https://www.audible.com/ted-ed

Uploaded 30-03-21

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Satan, the beast crunching sinners’ bones. Lucifer, the fallen angel. Mephistopheles, the trickster striking deals. These three divergent devils are all based on Satan of the Old Testament. But unlike any of these literary devils, the Satan of the Bible was a relatively minor character. So how did he become the ultimate antagonist, with so many different forms? Brian A. Pavlac investigates.

Lesson by Brian A. Pavlac, directed by Reza Riahi and Mehdi Shiri.

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The future of green is local -- and entrepreneurial. In her talk, Majora Carter brings us the stories of three people who are saving their own communities while saving the planet. Call it "hometown security." (Filmed at TEDxMidWest.)

Uploaded 25-07-13

Talk by Majora Carter.



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