TED-Ed

Trace the 9,000 year old history of the domestication of corn, or maize, and its effects on global agriculture.

Uploaded 26-11-19

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Corn currently accounts for more than one tenth of our global crop production. And over 99% of cultivated corn is the exact same type: Yellow Dent #2. This means that humans grow more Yellow Dent #2 than any other plant on the planet. So how did this single variety of this single plant become the biggest success story in agricultural history? Chris Kniesly investigates the rise of this wonder-crop.

Lesson by Chris A. Kniesly, directed by Artrake Studio.

Animator's website: https://www.artrake.com
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View full lesson: https://ed.ted.com/lessons/how-corn-conquered-the-world-chris-a-kniesly

Thank you so much to our patrons for your support! Without you this video would not be possible! Dee Wei, Richard A Berkley, Tim Armstrong, Daniel Nester, Hashem Al, denison martins fernandes, Doug Henry, Arlene Spiegelman, Michał Friedrich, Joshua Wasniewski, Maryam Dadkhah, Kristiyan Bonev, Keven Webb, Mihai Sandu, Deepak Iyer, Javid Gozalov, Emilia Alvarado, Jaime Arriola, Mirzat Tulafu, Lewis Westbury, Felipe Hoff, Rebecca Reineke, Cyrus Garay, Victoria Veretilo, Michael Aquilina, William Biersdorf, Patricia Alves Panagides, Valeria Sloan Vasquez, Mike Azarkman, Yvette Mocete, Pavel Maksimov, Victoria Soler-Roig, Betsy Feathers, Samuel Barbas, Therapist Gus, Sai Krishna Koyoda, Elizabeth Parker, William Bravante, Irindany Sandoval, Mark wisdom, Brighteagle, Beatriz Inácio, Mighterbump, Pamela Harrison, Maija Chapman, Liana Switzer, Curtis Light, The Brock, Dianne Palomar and Edgar Campos Barrachina.



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Until recently, many teachers only got one word of feedback a year: "satisfactory." And with no feedback, no coaching, there's just no way to improve. Bill Gates suggests that even great teachers can get better with smart feedback -- and lays out a program from his foundation to bring it to every classroom.

Uploaded 16-08-13

Talk by Bill Gates.



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Dig into the era of the Khmer Rouge in Cambodia, which perpetuated a genocide that killed a quarter of the country’s population.

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From 1975 to 1979, the Communist Party of Kampuchea ruled Cambodia with an iron fist, perpetrating a genocide that killed one fourth of the country’s population. Roughly one million people were executed as suspected political enemies or due to their ethnicities, and another million died of starvation, disease, or overwork. How did this happen? Timothy Williams details the rise of the Khmer Rouge.

Lesson by Timothy Williams, directed by Héloïse Dorsan-Rachet.

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View full lesson: https://ed.ted.com/lessons/ugly-history-cambodian-genocide-timothy-williams
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Animator's website: https://www.heloisedr.com & https://www.instagram.com/helo.dr
Music: https://www.campstudio.co
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Thank you so much to our patrons for your support! Without you this video would not be possible! Talia Sari, Katie McDowell, Allen, Sarat Chandra Vegunta, Mahina Knuckles, Charmaine Hanson, Paul Aldred-Bann, Thawsitt, Jezabel, Abdullah Abdulaziz, Adriano Fontes, Xiao Yu, Melissa Suarez, Brian A. Dunn, Francisco Amaya, Daisuke Goto, Matt Switzler, Leonardo Monrroy, Maryam, Bethany Connor, Jeremy Shimanek, Mark Byers, Avinash Amarnath, Xuebicoco, Rare Media, Rayo, Po Foon Kwong, NinjaBoffin, Jesse Jurman, Scott Markley, Elija Peterson, Ovidiu Mrd, paul g mohney, Aravind Battaje, Steven Razey, Nathan Giusti, Helen Lee, Anthony Benedict, Karthik Balsubramanian, John Hong, Annastasshia Ames, Sean, Amy Lopez, Vinh-Thuy Nguyen, Liz Candee, Ugur Doga Sezgin, Anthony Arcis, Karmi Nguyen, John C. Vesey and Yelena Baykova.

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View full lesson: http://ed.ted.com/lessons/what-really-happens-to-the-plastic-you-throw-away-emma-bryce

Uploaded 21-04-15

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 Bryce traces the life cycles of three different plastic bottles, shedding light on the dangers these disposables present to our world.

Lesson by Emma Bryce, animation by Sharon Colman.



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Learn the techniques and tricks that pyramid schemes use to recruit new members and how to avoid being fooled yourself.

Uploaded 02-04-19

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In 2004, a nutrition company offered a life-changing opportunity to earn a full-time income for part-time work. There were only two steps to get started: purchase a $500 kit and recruit two more members. By 2013, the company was making $200 million. There was just one problem -- the vast majority of members earned less than they paid in. Stacie Bosley explains what a pyramid scheme is and how to spot one.

Lesson by Stacie Bosley, directed by Wooden Plane Productions.

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View full lesson: https://ed.ted.com/lessons/how-to-spot-a-pyramid-scheme-stacie-bosley

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Take a look at 3 English language grammar rules to find out where they come from and if you actually need to follow them.

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Grammatical rules have caused heated debate in various regions and languages for centuries. But while we know people take grammar seriously, what’s less clear is, why? Where do these seemingly random rules come from, and which, if any, actually matter? Arika Okrent takes a closer look at three famous examples from the English language that have been the source of numerous grammatical arguments.

Lesson by Arika Okrent, directed by Sharon Colman.

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View full lesson: https://ed.ted.com/lessons/3-grammar-rules-that-you-dont-need-to-follow-anymore-arika-okrent
Dig deeper with additional resources: https://ed.ted.com/lessons/3-grammar-rules-that-you-dont-need-to-follow-anymore-arika-okrent/digdeeper

Animator's website: https://www.sharoncolman.com
Music: https://www.workplaywork.com
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TED-Ed's mission is to capture and amplify the voices of great educators around the world. We do this by pairing extraordinary educators with talented animators to produce a new library of curiosity-igniting videos. You can nominate a teacher, nominate an animator or suggest a lesson here: http://education.ted.com

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View the full lesson: http://ed.ted.com/lessons/how-many-un...

The fact that no one knows the answer to this question is what makes it exciting. The story of physics has been one of an ever-expanding understanding of the sheer scale of reality, to the point where physicists are now postulating that there may be far more universes than just our own. Chris Anderson explores the thrilling implications of this idea.

Lesson by Chris Anderson, animation by Andrew Park.

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Uploaded 19-04-18

View full lesson: https://ed.ted.com/lessons/how-the-world-s-first-subway-system-was-built-christian-wolmar

It was the dawn of 1863, and London's not-yet-opened subway system — the first of its kind in the world — had the city in an uproar. Most people thought the project, which cost more than 100 million dollars in today's money, would never work. So how did they do it? Christian Wolmar explains how the London Underground was built at a time when no one had built a railway under a city before.

Lesson by Christian Wolmar, animation by TED-Ed.

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Using newts, coyotes and mice, Jason Munshi-South shows how animals develop genetic differences in evolution, even within an urban city.

"Evolution in a Big City" was animated by the TED-Ed Animation Team (Jeremiah Dickey, Biljana Labovic, Celeste Lai, Kari Mulholland and Franz Palomares)

View the full lesson: http://ed.ted.com/lessons/evolution-in-a-big-city

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