TED-Ed

Join TED-Ed's Student Program: http://bit.ly/2Nps4NWUploaded 06-09-18View full lesson: https://ed.ted.com/lessons/what-is-the-universe-expanding-into-sajan-sainiThe universe began in a Big Bang nearly fourteen billion years ago, and has been expanding ever since. But how does the universe expand and what is it expanding into? Sajan Saini explains the existing theories around the Big Bang and what, if anything, lies beyond our universe. Lesson by Sajan Saini, directed by Wooden Plane Productions.Thank you so much to our patrons for your support! Without you this video would not be possible! Justin Carpani, Faiza Imtiaz, Khalifa Alhulail, Tejas Dc, Benjamin and Shannon Pinder, Srikote Naewchampa, Ex Foedus, Sage Curie, Exal Enrique Cisneros Tuch, Ana Maria, Vignan Velivela, Ibel Wong, Ahmad Hyari, eden sher, Travis Wehrman, Louisa Lee, Kiara Taylor, Hoang Viet, Nathan A. Wright, Jast3r , Аркадий Скайуокер, Milad Mostafavi, Rob Johnson, Ashley Maldonado, Clarence E. Harper Jr., Bojana Golubovic, Mihail Radu…

Practice more problem-solving at https://brilliant.org/TedEd/Solution to Bonus Riddle: https://brilliant.org/tededmislabelledboxes/Uploaded 10-09-18You’re overseeing the delivery of supplies to a rebel base in the heart of enemy territory. To get past customs, all packages must follow this rule: if a box is marked with an even number on the bottom, it must be sealed with a red top. One of the four boxes was sealed incorrectly, but they lost track of which one. Can you figure out which box it is and save the day? Alex Gendler shows how.Lesson by Alex Gendler, directed by Artrake Studio.Thank you so much to our patrons for supporting us on Patreon! Without you this video would not be possible! Jordan Tang, Christopher Jimenez, Juan, Tracey Tobkin, Sid, emily lam, Kathryn J Hammond, Elliot Poulin, Noel Situ, Latora Slydell, Sydney Evans, Victor E Karhel, Eysteinn Guðnason, Andrea Feliz, Natalia Rico, Josh Engel, Bárbara Nazaré, Zhexi Shan, PnDAA, Sandra Tersluisen, Ellen Spertus, Fabian Amels, sammie goh,…

View full lesson: http://ed.ted.com/lessons/at-what-moment-are-you-dead-randall-hayesUploaded 11-12-14For as far back as we can trace our existence, humans have been fascinated with death and resurrection. But is resurrection really possible? And what is the actual difference between a living creature and a dead body anyway? Randall Hayes delves into the scientific theories that seek to answer these age-old questions.Lesson by Randall Hayes, animation by Anton Bogaty. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Check out our Patreon page: https://www.patreon.com/tededUploaded 11-09-18View full lesson: https://ed.ted.com/lessons/is-there-any-truth-to-the-king-arthur-legends-alan-lupackKing Arthur has risen again and again in our collective imagination, along with his retinue of knights, Guinevere, the Round Table, Camelot, and of course Excalibur. But where do these stories come from, and is there any truth to them? Alan Lupack traces the evolution of King Arthur.Lesson by Alan Lupack, directed by Patrick Smith. Thank you so much to our patrons for your support! Without you this video would not be possible! Mary Sawyer, David Rosario, Samuel Doerle, Susan Herder, Prasanth Mathialagan, Yanira Santamaria, Dawn Jordan, Constantin Salagor, Kevin Wong, Umar Farooq, Goh Xiang Ting Diana, Cristóbal Medina Moenne, MJ Tan Mingjie, Yansong Li, Jason A Saslow, Henry Li, Kyle Nguyen, Taylor Hunter, Noa Shore, Lex Azevedo, Merit Gamertsfelder, Bev Millar, Rishi Pasham, Jhuval, SookKwan Loong, Daniel Day, Nick Johnson, Bruno…

View full lesson here: http://ed.ted.com/lessons/how-to-create-cleaner-coal-emma-bryceUploaded 09-12-14It takes a lot of fuel to heat our homes, preserve our food, and power our gadgets. And for 40 percent of the world, cheap, plentiful coal gets the job done. But coal also releases pollutants into the air, causing environmental damage like acid rain and serious health problems. Can we create a cleaner version of coal? Emma Bryce details the three ways we might strip coal of its foul forces.Lesson by Emma Bryce, animation by Artrake Studio. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Check out our Patreon page: https://www.patreon.com/tededUploaded 13-09-18View full lesson: https://ed.ted.com/lessons/how-do-cigarettes-affect-the-body-krishna-sudhirCigarettes aren’t good for us. That’s hardly news -- we’ve known about the dangers of smoking for decades. But how exactly do cigarettes harm us, and can our bodies recover if we stop? Krishna Sudhir details what happens when we smoke -- and when we quit. Lesson by Krishna Sudhir, directed by TED-Ed. Thank you so much to our patrons for your support! Without you this video would not be possible! Chris, Megan Douglas, Barbara Smalley, Filip Dabrowski, Clair Chen, Vik Nagjee, Karen Goepen-Wee, Della Palacios, Bah Becerra, Marc Bilodeau, Ruby Solorzano, Ivan Tsenov, Claudia Mayfield, Yankai Liu, Duo Xu, Joy Love Om, Gi Nam Lee, Shawn Quichocho, Anika Westburg, Barun Padhy, Devin Harris, Tony Trapuzzano, Jason Weinstein, Kris Siverhus, Alexander Walls, Annamaria Szilagyi, Morgan Williams, Abhijit Kiran Valluri, Mandeep Singh, سلطان الخليفي,…

View full lesson: http://ed.ted.com/lessons/the-2-400-year-search-for-the-atom-theresa-doudUploaded 08-12-14How do we know what matter is made of? The quest for the atom has been a long one, beginning 2,400 years ago with the work of a Greek philosopher and later continued by a Quaker and a few Nobel Prize-winning scientists. Theresa Doud details the history of atomic theory.Lesson by Theresa Doud, animation by TED-Ed. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

If you enjoy this lesson, we highly recommend reading "The World Without Us." A discounted e-book version is available here: https://amzn.to/2QwSPyHUploaded 17-09-18Check out our book rec page to learn more: https://shop.ed.ted.com/products/the-world-without-usView full lesson: https://ed.ted.com/lessons/what-would-happen-if-every-human-suddenly-disappeared-dan-kwartlerHuman beings are everywhere. With settlements on every continent, we can be found in the most isolated corners of Earth’s jungles, oceans and tundras. Our impact is so profound, most scientists believe humanity has left a permanent mark on Earth’s geological record. So what would happen if suddenly, every human on Earth disappeared? Dan Kwartler investigates.Lesson by Dan Kwartler, directed by Globizco Studios.Thank you so much to our patrons for your support! Without you this video would not be possible! Tsz Hin Edmund Chan, Melvin Williams, Tirath Singh Pandher, Athena Grace Franco, Terry Minion, Ian McPherson, Mauricio Basso, Kelvin Lam,…

Check out our Patreon page: https://www.patreon.com/tededUploaded 18-09-18View full lesson: https://ed.ted.com/lessons/why-should-you-read-edgar-allan-poe-scott-peeplesThe prisoner strapped under a descending pendulum blade. A raven who refuses to leave the narrator’s chamber. A beating heart buried under the floorboards. Poe’s macabre and innovative stories of gothic horror have left a timeless mark on literature. But just what is it that makes Edgar Allan Poe one of the greatest American authors? Scott Peeples investigates. Lesson by Scott Peeples, directed by Compote Collective.Thank you so much to our patrons for your support! Without you this video would not be possible! Vignan Velivela, Ibel Wong, Ahmad Hyari, Eden Sher, Travis Wehrman, Louisa Lee, Hoang Viet, Nathan A. Wright, Аркадий Скайуокер, Ashley Maldonado, Clarence E. Harper Jr., Bojana Golubovic, Karthik Cherala, Violeta Cervantes, Elaine Fitzpatrick, Lyn-z Schulte, cnorahs , Henrique Sorín' Cassús, Tim Robinson, Jun Cai, Paul Schneider, Amber…

Download a free audiobook version of "The Hitchhiker's Guide to the Galaxy" and support TED-Ed's nonprofit mission: https://adbl.co/2xqDYxYUploaded 20-09-18Check out our full book recommendation: https://shop.ed.ted.com/products/a-hitchhikers-guide-to-the-galaxyView full lesson: https://ed.ted.com/lessons/could-the-earth-be-swallowed-by-a-black-hole-fabio-pacucciFrom asteroids capable of destroying entire species to supernovae that could exterminate life on Earth, outer space has no shortage of forces that could wreak havoc on our planet. But there’s something in space that is even more terrifying than any of these -- something that wipes out everything it comes near. Fabio Pacucci examines the probability of Earth being gobbled up by a black hole. Lesson by Fabio Pacucci, directed by Astroplastique.Thank you so much to our patrons for your support! Without you this video would not be possible! Rakesh Katragadda, Sergi Páez, Jørgen Østerpart, Cindy O., Nicu Boanda, Reagen O'Connor, Sabrina Gonzalez, Dino ,…

Practice more problem-solving at https://brilliant.org/TedEd/Solution to Bonus Riddle: https://brilliant.org/TedEd3ColorCube/Uploaded 24-09-18Your team has developed a probe to study an alien monolith. It needs protective coatings — in red, purple or green — to cope with the environments it passes through. Can you figure out how to apply the colors so the probe survives the trip? Dan Finkel shows how. Lesson by Dan Finkel, directed by Anton Trofimov. Thank you so much to our patrons for supporting us on Patreon! Without you this video would not be possible! Ken, James Bruening, Michael Braun-Boghos, Ricardo Diaz, Kack-Kyun Kim, Artem Minyaylov, Danny Romard, Yujing Jiang, Stina Boberg, Anthony Wiggins, Hoai Nam Tran, Joe Sims, David Petrovič, Chris Adriaensen, Lowell Fleming, Sunny Patel, Vijayalakshmi , Uday Kishore, Aidan Forero, Leen Mshasha, Allan Hayes, Vaibhav Mirjolkar, Tony, Michelle, Katie and Josh Pedretti, Erik Biemans, Gaurav Mathur, Hans Peng, Tekin Gültekin, Hector Quintanilla, Penelope…

View full lesson: http://ed.ted.com/lessons/what-does-the-liver-do-emma-bryceUploaded 25-11-14There’s a factory inside you that weighs about 1.4 kilograms and runs for 24 hours a day. It’s your liver: the heaviest organ in your body, which simultaneously acts as a storehouse, a manufacturing hub, and a processing plant. Emma Bryce gives a crash course on the liver and how it helps keep us alive.Lesson by Emma Bryce, animation by Andrew Zimbelman for The Foreign Correspondents' Club. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Check out our Patreon page: https://www.patreon.com/tededUploaded 25-09-18View full lesson: https://ed.ted.com/lessons/the-myth-of-hercules-12-labors-in-8-bits-alex-gendlerHercules — son of Zeus and champion of humankind — stricken with a temporary curse of madness, has just committed the most unspeakable crime imaginable. Seeking to atone for the deaths of his family, Hercules must complete twelve impossible tasks that pit him against invincible monsters and unfathomable forces. Alex Gendler retells this epic series of adventures.Lesson by Alex Gendler, directed by Jérémie Balais and Jeff Le Bars. Thank you so much to our patrons for your support! Without you this video would not be possible! Elizabeth Parker, Sai Krishna Koyoda, Samuel Barbas, Maxwell Ingram, Victoria Soler-Roig, Abdulmateen Aderinto, Pavel Maksimov, Barbara Younker, Cyrus Garay, Yvette Mocete, Mike Azarkman, Patricia Alves Panagides, William Biersdorf, Michael Aquilina, Vinamr , FireWolfLasers , Kshitij Shah, Mohammad Said, Teach Me Diné…

Take a journey into the lungs to see how the respiratory system and automatic nervous system work together to keep us alive and breathing. Uploaded 24-11-14--When you breathe, you transport oxygen to the body’s cells to keep them working, while also clearing your system of the carbon dioxide that this work generates. How do we accomplish this crucial and complex task without even thinking about it? Emma Bryce takes us into the lungs to investigate how they help keep us alive.Lesson by Emma Bryce, animation by Andrew Zimbelman for The Foreign Correspondents' Club.Sign up for our newsletter: http://bit.ly/TEDEdNewsletterSupport us on Patreon: http://bit.ly/TEDEdPatreonFollow us on Facebook: http://bit.ly/TEDEdFacebookFind us on Twitter: http://bit.ly/TEDEdTwitterPeep us on Instagram: http://bit.ly/TEDEdInstagramView full lesson: http://ed.ted.com/lessons/what-do-the-lungs-do-emma-bryce Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Check out our Patreon page: https://www.patreon.com/tededUploaded 27-09-18View full lesson: https://ed.ted.com/lessons/the-end-of-history-illusion-bence-nanayTime and time again, we’ve failed to predict that the technologies of the present will change the future. Recently, a similar pattern was discovered in our individual lives: we’re unable to predict change in ourselves. But is there anything wrong with assuming that who we are now is who we will continue to be? Bence Nanay details the consequences of seeing ourselves as finished products.Lesson by Bence Nanay, directed by Stretch Films Inc. Thank you so much to our patrons for your support! Without you this video would not be possible! Denise A Pitts, Pi Guanghui, Doris, Kurt Almendras, Raymond Lee, Nicolas Silva, Melvin Williams, Tirath Singh Pandher, Terry Minion, Mauricio Basso, Jamesbo87, Karlee Finch, Chumi Ogbonna, Barthélémy Michalon, Lefty McGoo, Chris Thompson, Derek Drescher, Karisa Caudill, Christina Salvatore, Brady Jones, Todd Gross, Alexis…

What kinds of valuable rare minerals are in a smartphone? Take a closer look and consider the sustainability of phone production.Uploaded 01-10-18--As of 2018, there are around 2.5 billion smartphone users in the world. If we broke open all the newest phones and split them into their component parts, that would produce around 85,000 kg of gold, 875,000 of silver, and 40,000,000 of copper. How did this precious cache get into our phones--and can we reclaim it? Kim Preshoff investigates the sustainability of phone production. Lesson by Kim Preshoff, directed by Compote Collective.Sign up for our newsletter: http://bit.ly/TEDEdNewsletterSupport us on Patreon: http://bit.ly/TEDEdPatreonFollow us on Facebook: http://bit.ly/TEDEdFacebookFind us on Twitter: http://bit.ly/TEDEdTwitterPeep us on Instagram: http://bit.ly/TEDEdInstagramView full lesson: https://ed.ted.com/lessons/what-s-a-smartphone-made-of-kim-preshoffThank you so much to our patrons for your support! Without you this video would not be possible!…

Check out our Patreon page: https://www.patreon.com/tededUploaded 02-10-18View full lesson: https://ed.ted.com/lessons/everything-you-need-to-know-to-read-the-canterbury-tales-iseult-gillespieA portly Miller, barely able to sit on his horse, rambles on about the flighty wife of a crotchety old carpenter and the scholar she takes as her lover. This might sound like a bawdy joke, but it’s part of one of the most esteemed works of English literature ever created: The Canterbury Tales. Iseult Gillespie shares everything you need to know to read Geoffrey Chaucer’s classic collection.Lesson by Iseult Gillespie, directed by Anton Bogaty.Thank you so much to our patrons for your support! Without you this video would not be possible! Sebastian Regez, Danielle Downs, Clovis Norroy, Liz Candee, Vinh-Thuy Nguyen, Amy Lopez, SANG HAN, Aries SW, Sebastiaan Hols, Grimes Gregory, João Henrique Rodrigues, Michael Lucke, Annastasshia Ames, Claudia Hernandez Chavarria, Livia-Alexandra Sarban, Lee , Karthik Balsubramanian,…

Throughout history, scientists have proposed conflicting ideas on how the brain carries out functions like perception, memory, and movement. Is each of these tasks carried out by a specific area of the brain? Or do multiple areas work together to accomplish them? Ted Altschuler investigates both sides of the debate.Uploaded 17-11-14Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Check out our Patreon page: https://www.patreon.com/tededUploaded 04-10-18View full lesson: https://ed.ted.com/lessons/the-fascinating-science-of-phantom-limbs-joshua-w-pateThe vast majority of people who’ve lost a limb can still feel it — not as a memory or vague shape, but in complete lifelike detail. They can flex their phantom fingers and sometimes even feel the chafe of a watch band or the throb of an ingrown toenail. What causes these phantom limb sensations? Joshua W. Pate explains how the brain reacts to a missing limb. Lesson by Joshua W. Pate, directed by Kozmonot Animation Studio.Thank you so much to our patrons for your support! Without you this video would not be possible! Arturo De Leon, Eduardo Briceño, Ricardo Paredes, David Douglass, Grant Albert, Jen, Megan Whiteleather, Mayank Kaul, Ryohky Araya, Tan YH, Ph.D., Brittiny Elman, Kostadin Mandulov, Yanuar Ashari, Mrinalini , Anthony Kudolo, Querida Owens, Hazel Lam, Manav parmar, Siamak H, Dominik Kugelmann, Mary Sawyer, David Rosario, Samuel…

Check out our Patreon page: https://www.patreon.com/tededUploaded 08-10-18Mounting his skinny steed, Don Quixote charges an army of giants. It is his duty to vanquish these behemoths in the name of his beloved lady, Dulcinea. There’s only one problem: the giants are merely windmills. What is it about this tale of the clumsy yet valiant knight that makes it so beloved? Ilan Stavans investigates. Lesson by Ilan Stavans, directed by Avi Ofer.Thank you so much to our patrons for your support! Without you this video would not be possible! Boytsov Ilya, maxi kobi einy, Misaki Sato, Andrew Bosco, Nik Maier, Mark Morris, Tamás Drávai, Adi V, Peter Liu, Leora Allen, Hiroshi Uchiyama, Julie Cummings-Debrot, Gilly, Ka-Hei Law, Maya Toll, Aleksandar Srbinovski, Ricardo Rendon Cepeda, Renhe Ji, Andrés Melo Gámez, Tim Leistikow, Chris, Megan Douglas, Barbara Smalley, Filip Dabrowski, Clair Chen, Vik Nagjee, Karen Goepen-Wee, Della Palacios, Bah Becerra, Marc Bilodeau, Ruby Solorzano, Ivan Tsenov, Claudia Mayfield, Yankai…

Practice more problem-solving at https://brilliant.org/TedEd/Solution to Bonus Riddle: https://brilliant.org/TedEdRoboAnts/Uploaded 09-10-18The good news is that your experimental robo-ants are a success. The bad news is that you accidentally gave them the ability to shoot deadly lasers … and you can’t turn it off. Can you stop them from escaping their habitat before the lasers are activated? Dan Finkel shows how. Lesson by Dan Finkel, directed by Artrake Studio.Thank you so much to our patrons for supporting us on Patreon! Without you this video would not be possible! Armando Ello, Ayala Ron, Manognya Chakrapani, Doreen Reynolds-Consolati, Melissa Sorrells, Antony Lee, Husain Mohammad, Côme Vincent, Astia Rizki Safitri, Alan Froese, alessandra tasso, Gerald Onyango, Katrina Harding, Ezgi Yersu, Katie Dean, Kin Lon Ma, Carsten Tobehn, Jeremy Fryd, Charlene You, Carolyn Corwin, rakesh Katragadda, Sergi Páez, Jørgen Østerpart, Cindy O., Nicu Boanda, Reagen O'Connor, Sabrina Gonzalez, Dino, Hadi Salahshour,…

Check out our Patreon page: https://www.patreon.com/tededUploaded 11-10-18View full lesson: https://ed.ted.com/lessons/history-through-the-eyes-of-a-chicken-chris-a-knieslyThe Ancient Egyptian king Thutmose III described the chicken as a marvelous foreign bird that “gives birth daily.” Romans brought them on their military campaigns to foretell the success of future battles. Today, this bird occupies a much less honorable position – on dinner plates. Chris Kniesly explains the evolving role of chickens throughout history. Lesson by Chris A. Kniesly, directed by Mark Phillips.Thank you so much to our patrons for your support! Without you this video would not be possible! Marylise CHAUFFETON, Marvin Vizuett, Jayant Sahewal, Quinn Shen, Elizabeth Cruz, Elnathan Joshua Bangayan, Mullaiarasu Sundaramurthy, Jose Henrique Leopoldo e Silva, Dan Paterniti, Jerome Froelich, Tyler Yoshizumi, Martin Stephen, Justin Carpani, Khalifa Alhulail, Tejas Dc, Benjamin and Shannon Pinder, Srikote Naewchampa, Ex Foedus, Exal…

Check out our Patreon page: https://www.patreon.com/tededUploaded 15-10-18View full lesson: https://ed.ted.com/lessons/why-should-you-read-waiting-for-godot-iseult-gillespieTwo men, Estragon and Vladimir, meet by a tree at dusk to wait for someone named “Godot.” So begins a vexing cycle where the two debate when Godot will come, why they’re waiting and whether they’re even at the right tree. The play offers a simple but stirring question- what should the characters do? Iseult Gillespie shares everything you need to know to read the tragicomedy. Lesson by Iseult Gillespie, directed by Tomás Pichardo-Espaillat.Thank you so much to our patrons for your support! Without you this video would not be possible! Martin Lau, Robson Martinho, Cailin Ramsey, Aaron Henson, John Saveland, Nicolle Fieldsend-Roxborough, ReuniteKorea, Venkat Venkatakrishnan, QIUJING L BU, Yoga Trapeze Wanderlust, Jaron Blackburn, Alejandro Cachoua, Thomas Mungavan, Edla Paniguel, Anna-Pitschna Kunz, Tim Armstrong, Erika Blanquez, Ricki…

Check out our Patreon page: https://www.patreon.com/tededUploaded 16-10-18View full lesson: https://ed.ted.com/lessons/what-if-cracks-in-concrete-could-fix-themselves-congrui-jinConcrete is the most widely used construction material in the world. It can be found in swathes of city pavements, bridges that span vast rivers and the tallest skyscrapers on earth. But it does have a weakness: it’s prone to catastrophic cracking that has immense financial and environmental impact. What if we could avoid that problem? Congrui Jin explores how to create a more resilient concrete. Lesson by Congrui Jin, directed by Aeon Production.Thank you so much to our patrons for your support! Without you this video would not be possible! Emma Moyse, Fahad Nasser Chowdhury, Marin Kovachev, Roman Pinchuk, Daniel Huerga, Maria Lerchbaumer, Edgar Campos Barrachina, Dianne Palomar, The Brock, Curtis Light, Ernest Chow, Liana Switzer, Maija Chapman, Pamela Harrison, Mighterbump , Beatriz Inácio, Robert Hargis, Mircea Sîrbu, Irindany…

View full lesson: http://ed.ted.com/lessons/the-language-of-lying-noah-zandanUploaded 03-11-14We hear anywhere from 10 to 200 lies a day. And although we’ve spent much of our history coming up with ways to detect these lies by tracking physiological changes in their tellers, these methods have proved unreliable. Is there a more direct approach? Noah Zandan uses some famous examples of lying to illustrate how we might use communications science to analyze the lies themselves.Lesson by Noah Zandan, animation by The Moving Company Animation Studio. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Check out our Patreon page: https://www.patreon.com/tededUploaded 18-10-18View full lesson: https://ed.ted.com/lessons/why-can-t-some-birds-fly-gillian-gibbThough the common ancestor of all modern birds could fly, many different bird species have independently lost their flight. Flight can have incredible benefits, especially for escaping predators, hunting and traveling long distances. But it also has high costs: consuming huge amounts of energy and limiting body size and weight. Gillian Gibb explores what makes birds give up the power of flight. Lesson by Gillian Gibb, directed by Anton Bogaty.Thank you so much to our patrons for your support! Without you this video would not be possible! Paul Beard, Deepak Iyer, Markus Goldhacker, Mihai Sandu, Keven Webb, Hendrik Mueller, Maurice Castonguay, Kristiyan Bonev, Maryam Dadkhah, Joshua Wasniewski, Michał Friedrich, Arlene Spiegelman, Doug Henry, Alick Au, denison martins fernandes, Daniel Nester, Richard A Berkley, Benjamin Chan, Dee Wei, Abdallah Absi, Denise…

Check out our Patreon page: https://www.patreon.com/tededUploaded 22-10-18View full lesson: https://ed.ted.com/lessons/the-princess-who-rewrote-history-leonora-nevilleAnna Komnene, daughter of Byzantine emperor Alexios, spent the last decade of her life creating a 500-page history of her father’s reign called “The Alexiad.” As a princess writing about her own family, she had to balance her loyalty to her kin with her obligation to portray events accurately. Leonora Neville investigates this epic historical narrative. Lesson by Leonora Neville, directed by Els Decaluwe.Thank you so much to our patrons for your support! Without you this video would not be possible! Jen O'Hogan, Renu Balak, JY Kang, Anastasiia, Madee Lo, Arpita Singh, Karl Laius, Barbarossa , Tu-Anh Nguyen, Guy Hardy, Sebastiaan Vleugels, Joel Alfonso, Derya Goekcay, Brandy Sarver, Jose Arcadio Valdes Franco, Akinola Emmanuel, igor romanenko, Dian Atamyanov, Abhishek Bansal, Austin Randall, Jennifer Kurkoski, phkphk12321, Arlene Weston, Mehmet…

Download a free audiobook version of "A Brief History of Time" and support TED-Ed's nonprofit mission: https://adbl.co/2NWYjAhUploaded 23-10-18Check out our full book recommendation: https://shop.ed.ted.com/collections/ted-ed-book-recommendations/products/a-brief-history-of-timeView full lesson: https://ed.ted.com/lessons/does-time-exist-andrew-zimmerman-jonesThe earliest time measurements were observations of cycles of the natural world, using patterns of changes from day to night and season to season to build calendars. More precise time-keeping eventually came along to put time in more convenient boxes. But what exactly are we measuring? Andrew Zimmerman Jones contemplates whether time is something that physically exists or is just in our heads.Lesson by Andrew Zimmerman Jones, directed by Nice Shoes.Thank you so much to our patrons for your support! Without you this video would not be possible! Chung Wah Gnapp, Andrew Sprott, Jane White, Ayan Doss, BRENDAN NEALE, Lawrence Teh Swee Kiang, Alex Pierce,…

Explore some of the most famous arguments in the ancient debate: is math a human construct or part of the fabric of the universe?Uploaded 27-10-14--Would mathematics exist if people didn't? Did we create mathematical concepts to help us understand the world around us, or is math the native language of the universe itself? Jeff Dekofsky traces some famous arguments in this ancient and hotly debated question. Lesson by Jeff Dekofsky, animation by The Tremendousness Collective.Sign up for our newsletter: http://bit.ly/TEDEdNewsletterSupport us on Patreon: http://bit.ly/TEDEdPatreonFollow us on Facebook: http://bit.ly/TEDEdFacebookFind us on Twitter: http://bit.ly/TEDEdTwitterPeep us on Instagram: http://bit.ly/TEDEdInstagramView full lesson: http://ed.ted.com/lessons/is-math-discovered-or-invented-jeff-dekofsky Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Practice more problem-solving at https://brilliant.org/TedEd/Solution to Bonus Riddle: https://brilliant.org/TedEdRuby/Uploaded 25-10-18Townspeople are demanding that a corrupt merchant’s collection of 30 rubies be confiscated to reimburse the victims of his schemes. The king announces that the fine will be determined through a game of wits between the merchant and the king’s most clever advisor – you. Can you outfox the merchant and win back the greatest amount of rubies to help his victims? Dennis Shasha shows how. Lesson by Dennis Shasha, directed by Artrake Studio. Thank you so much to our patrons for supporting us on Patreon! Without you this video would not be possible! Sydney Evans, Victor E Karhel, Eysteinn Guðnason, Andrea Feliz, Natalia Rico, Josh Engel, Bárbara Nazaré, Zhexi Shan, PnDAA, Sandra Tersluisen, Ellen Spertus, Fabian Amels, sammie goh, Mattia Veltri, Quentin Le Menez, Yuh Saito, Heather Slater, Dr Luca Carpinelli, Christophe Dessalles, Arturo De Leon, Eduardo Briceño, Ricardo Paredes,…

View full lesson: http://ed.ted.com/lessons/is-our-climate-headed-for-mathematical-chaos-victor-j-donnayUploaded 23-10-14Scientists have warned that as CO2 levels in the atmosphere rise an increase in Earth’s temperature by even two degrees could lead to catastrophic effects across the world. But how can such a tiny, measurable change in one factor lead to huge, unpredictable changes elsewhere? Victor J. Donnay uses billiards to illustrate tipping points, chaotic motion and their implications on climate change. Lesson by Victor J. Donnay, animation by Karrot Animation. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Dig into the engineering of rollercoasters, and explore how these thrilling rides are built to be scary and safe at the same time.Uploaded 29-10-18--In 1895, crowds flooded Coney Island to see America’s first-ever looping coaster: the Flip Flap Railway. But its thrilling flip caused cases of severe whiplash, neck injury and even ejections. Today, coasters can pull off far more exciting tricks and do it safely. Brian D. Avery investigates what rollercoasters are doing to your body and how they’ve managed to get scarier and safer at the same time. Lesson by Brian D. Avery, directed by Stretch Films Inc.Support Our Non-Profit Mission----------------------------------------------Support us on Patreon: http://bit.ly/TEDEdPatreonCheck out our merch: http://bit.ly/TEDEDShop----------------------------------------------Connect With Us----------------------------------------------Sign up for our newsletter: http://bit.ly/TEDEdNewsletterFollow us on Facebook: http://bit.ly/TEDEdFacebookFind us on Twitter:…

View full lesson: http://ed.ted.com/lessons/how-do-germs-spread-and-why-do-they-make-us-sick-yannay-khaikin-and-nicole-mideoUploaded 21-10-14Germs are found on almost every surface we come in contact with, which makes it incredibly common for our bodies to be exposed to them. But why are some of these germs relatively harmless, while others can be fatal? Yannay Khaikan and Nicole Mideo explore this question by examining germs’ varying modes of transmission. Lesson by Yannay Khaikin and Nicole Mideo, animation by Ace and Son Moving Picture Co., LLC. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Check out our Patreon page: https://www.patreon.com/tededUploaded 30-10-18View full lesson: https://ed.ted.com/lessons/the-fascinating-history-of-cemeteries-keith-eggenerSpindly trees, rusted gates, crumbling stone, a solitary mourner: these things come to mind when we think of cemeteries. But not long ago, many burial grounds were lively places, with gardens and crowds of people -- and for much of human history, we didn’t bury our dead at all. How did cemeteries become what they are today? Keith Eggener delves into our ever-evolving rituals for honoring the dead. Lesson by Keith Eggener, directed by Remus and Kiki.Thank you so much to our patrons for your support! Without you this video would not be possible! Mary Sawyer, David Rosario, Samuel Doerle, Susan Herder, Prasanth Mathialagan, Yanira Santamaria, Dawn Jordan, Constantin Salagor, Kevin Wong, Umar Farooq, Goh Xiang Ting Diana, Cristóbal Medina Moenne, MJ Tan Mingjie, Yansong Li, Jason A Saslow, Henry Li, Kyle Nguyen, Taylor Hunter, Noa Shore, Lex…

View full lesson: http://ed.ted.com/lessons/a-different-way-to-visualize-rhythm-john-varneyUploaded 20-10-14In standard notation, rhythm is indicated on a musical bar line. But there are other ways to visualize rhythm that can be more intuitive. John Varney describes the ‘wheel method’ of tracing rhythm and uses it to take us on a musical journey around the world. Lesson by John Varney, animation by TED-Ed. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Check out our Patreon page: https://www.patreon.com/tededUploaded 01-11-18View full lesson: https://ed.ted.com/lessons/what-causes-heartburn-rusha-modiHumans have been battling heartburn for hundreds, if not thousands, of years. But recently the incidence has risen, making it a common complaint worldwide. What causes this problem, and how can it be stopped? Rusha Modi details the causes and treatments of heartburn.Lesson by Rusha Modi, directed by Kozmonot Animation Studio.Thank you so much to our patrons for your support! Without you this video would not be possible! Chris, Megan Douglas, Barbara Smalley, Filip Dabrowski, Clair Chen, Vik Nagjee, Karen Goepen-Wee, Della Palacios, Bah Becerra, Marc Bilodeau, Ruby Solorzano, Ivan Tsenov, Claudia Mayfield, Yankai Liu, Duo Xu, Joy Love Om, Gi Nam Lee, Shawn Quichocho, Anika Westburg, Barun Padhy, Devin Harris, Tony Trapuzzano, Jason Weinstein, Kris Siverhus, Alexander Walls, Annamaria Szilagyi, Morgan Williams, Abhijit Kiran Valluri, Mandeep Singh, سلطان…

View full lesson: http://ed.ted.com/lessons/einstein-s-brilliant-mistake-entangled-states-chad-orzelUploaded 16-10-14When you think about Einstein and physics, E=mc^2 is probably the first thing that comes to mind. But one of his greatest contributions to the field actually came in the form of an odd philosophical footnote in a 1935 paper he co-wrote -- which ended up being wrong. Chad Orzel details Einstein's "EPR" paper and its insights on the strange phenomena of entangled states. Lesson by Chad Orzel, animation by Gunborg/Banyai. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Check out our Patreon page: https://www.patreon.com/tededUploaded 05-11-18View full lesson: https://ed.ted.com/lessons/is-fire-a-solid-a-liquid-or-a-gas-elizabeth-coxSitting around a campfire, you can feel its heat, smell the woody smoke, and hear it crackle. If you get too close, it burns your eyes and stings your nostrils. You could stare at the bright flames forever as they twist and flicker in endless incarnations… But what exactly are you looking at? Elizabeth Cox illuminates the science behind fire. Lesson by Elizabeth Cox, directed by Héloïse Dorsan Rachet.Thank you so much to our patrons for your support! Without you this video would not be possible! Vignan Velivela, Ibel Wong, Ahmad Hyari, eden sher, Travis Wehrman, Louisa Lee, Hoang Viet, Nathan A. Wright, Аркадий Скайуокер, Ashley Maldonado, Clarence E. Harper Jr., Bojana Golubovic, Karthik Cherala, haventfiguredout , Violeta Cervantes, Elaine Fitzpatrick, Lyn-z Schulte, cnorahs, Henrique Sorín' Cassús, Tim Robinson, Jun Cai, Paul Schneider, Amber…

View full lesson: http://ed.ted.com/lessons/schrodinger-s-cat-a-thought-experiment-in-quantum-mechanics-chad-orzelUploaded 14-10-14Austrian physicist Erwin Schrödinger, one of the founders of quantum mechanics, posed this famous question: If you put a cat in a sealed box with a device that has a 50% chance of killing the cat in the next hour, what will be the state of the cat when that time is up? Chad Orzel investigates this thought experiment. Lesson by Chad Orzel, animation by Agota Vegso. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Check out our Patreon page: https://www.patreon.com/tededUploaded 06-11-18View full lesson: https://ed.ted.com/lessons/how-far-would-you-have-to-go-to-escape-gravity-rene-lauferEvery star, black hole, human being, smartphone and atom are all constantly pulling on each other due to one force: gravity. So why don’t we feel pulled in billions of different directions? And is there anywhere in the universe where we'd be free of its pull? Rene Laufer details the inescapability of gravity. Lesson by Rene Laufer, directed by TED-Ed.Thank you so much to our patrons for your support! Without you this video would not be possible! rakesh Katragadda, Sergi Páez, Jørgen Østerpart, Cindy O., Nicu Boanda, Reagen O'Connor, Sabrina Gonzalez, Dino , Hadi Salahshour, Clement , Nick Debenedictis, Abdullah Altuwaijri, Jessie McGuire, Divina Grace Dar Santos, Brian Richards, Farah Abdelwahab, Mikhail Shkirev, Malcolm Callis, David Matthew Ezroj, Ever Granada, fatima kried, Begum Tutuncu, Lala Arguelles, Mehmet Sencer KARADAYI,…

View full lesson: http://ed.ted.com/lessons/history-vs-christopher-columbus-alex-gendlerUploaded 13-10-14Many people in the United States and Latin America have grown up celebrating the anniversary of Christopher Columbus’s voyage. But was he an intrepid explorer who brought two worlds together or a ruthless exploiter who brought colonialism and slavery? And did he even discover America at all? Alex Gendler puts Columbus on the stand in History vs. Christopher Columbus. Lesson by Alex Gendler, animation by Brett Underhill. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Practice more problem-solving at https://brilliant.org/TedEd/Signup to receive the bonus riddle's solution: https://brilliant.org/TedEdWerewolf/Uploaded 08-11-18You’re on the trail of a werewolf that’s been terrorizing your town. After months of detective work, you’ve narrowed your suspects to one of five people. You’ve invited them to dinner with a simple plan: to slip a square of a rare antidote into each of their dinners. Unfortunately, you only have one square left. Can you divide it into perfect fifths and cure the werewolf? Dan Finkel shows how.Lesson by Dan Finkel, directed by Artrake Studio.Thank you so much to our patrons for your support! Without you this video would not be possible! Ken, James Bruening, Michael Braun-Boghos, Ricardo Diaz, Kack-Kyun Kim, Artem Minyaylov, Danny Romard, Yujing Jiang, Stina Boberg, Anthony Wiggins, Hoai Nam Tran, Joe Sims, David Petrovič, Chris Adriaensen, Lowell Fleming, Sunny Patel, Vijayalakshmi , Uday Kishore, Aidan Forero, Leen Mshasha, Allan Hayes, Vaibhav…

View full lesson: http://ed.ted.com/lessons/how-do-we-measure-distances-in-space-yuan-sen-tingUploaded 09-10-14When we look at the sky, we have a flat, two-dimensional view. So how do astronomers figure the distances of stars and galaxies from Earth? Yuan-Sen Ting shows us how trigonometric parallaxes, standard candles and more help us determine the distance of objects several billion light years away from Earth. Lesson by Yuan-Sen Ting, animation by TED-Ed. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Check out our Patreon page: https://www.patreon.com/tededUploaded 12-11-18View full lesson: https://ed.ted.com/lessons/history-vs-henry-viii-mark-robinson-and-alex-gendlerHe was a powerful king whose break with the church of Rome would forever change the course of English history. But was he a charismatic reformer who freed his subjects from a corrupt establishment or a bullying tyrant who used Parliament for his own personal gain? Mark Robinson and Alex Gendler put this controversial figure on trial in History vs. Henry VIII. Lesson by Mark Robinson and Alex Gendler, directed by Brett Underhill. Thank you so much to our patrons for your support! Without you this video would not be possible! Elizabeth Parker, Sai Krishna Koyoda, Samuel Barbas, Maxwell Ingram, Victoria Soler-Roig, Abdulmateen Aderinto, Pavel Maksimov, Barbara Younker, Cyrus Garay, Yvette Mocete, Mike Azarkman, Patricia Alves Panagides, William Biersdorf, Michael Aquilina, Vinamr, FireWolfLasers , Kshitij Shah, Mohammad Said, Teach Me Dine…

View full lesson: http://ed.ted.com/lessons/how-do-we-study-the-stars-yuan-sen-tingUploaded 07-10-14Our best technology can send men to the Moon and probes to the edge of our solar system, but these distances are vanishingly small compared to the size of the universe. How then can we learn about the galaxies beyond our own? Yuan-Sen Ting takes us into deep space to show how astronomers study the stars beyond our reach. Lesson by Yuan-Sen Ting, animation by Kozmonot Animation Studio. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Download a free audiobook version of "Man's Search for Meaning" and support TED-Ed's nonprofit mission: https://adbl.co/2z7JGWxUploaded 13-11-18Check out our full book recommendation: https://bit.ly/2JYUn1ySisyphus was both a clever ruler who made his city prosperous, and a devious tyrant who seduced his niece and killed visitors to show off his power. While his violation of the sacred hospitality tradition greatly angered the gods, it was Sisyphus’ reckless confidence that proved to be his downfall -- resulting in Zeus condemning him for all eternity. Alex Gendler shares the myth of Sisyphus. Lesson by Alex Gendler, directed by Adriatic Animation. Thank you so much to our patrons for your support! Without you this video would not be possible! Denise A Pitts, Pi Guanghui, Doris, Kurt Almendras, Raymond Lee, Nicolas Silva, Melvin Williams, Tirath Singh Pandher, Terry Minion, Mauricio Basso, Jamesbo87 , Karlee Finch, Chumi Ogbonna, Barthélémy Michalon, Lefty McGoo, Prefer Anonymous, Chris Thompson, Derek…

View full lesson: http://ed.ted.com/lessons/what-s-the-value-of-vitamins-ginnie-trinh-nguyenUploaded 06-10-14Vitamins are the building blocks that keep our bodies running; they help build muscle and bone, capture energy, heal wounds and more. But if our body doesn’t create vitamins, how do they get into our system? Ginnie Trinh Nguyen describes what vitamins are, how they get into our bodies -- and why they are so crucial.Lesson by Ginnie Trinh Nguyen, animation by The Moving Company Animation Studio. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Check out our Patreon page: https://www.patreon.com/tededUploaded 15-11-18View full lesson: https://ed.ted.com/lessons/the-standard-model-of-particle-physics-jonathan-butterworthIf you were to take a coffee cup, and break it in half, then in half again, and keep carrying on, where would you end up? Could you keep on going forever? Or would you eventually find a set of indivisible building blocks out of which everything is made? Jonathan Butterworth explains the Standard Model theory and how it helps us understand the world we live in.Lesson by Jon Butterworth, directed by Nick Hilditch. Thank you so much to our patrons for your support! Without you this video would not be possible! Jennifer Kurkoski, phkphk12321, Arlene Weston, Mehmet Yusuf Ertekin, Ten Cha, Les Howard, Kevin O'Leary, Francisco Leos, Robert Patrick, Jorge, Marcus Appelbaum, Alan Wilder, Amin Talaei, Mohamed Elsayed, Angel Pantoja, Eimann P. Evarola, Claire Ousey, Carlos H. Costa, Tariq Keblaoui, Bela Namyslik, Nick Johnson, Won Jang, Johnnie…

View full lesson: http://ed.ted.com/lessons/why-do-some-people-go-bald-sarthak-sinhaUploaded 02-10-14If you are a living, breathing human being, chances are you have felt sad at least a few times in your life. But what exactly is melancholy, and what (if anything) should we do about it? Courtney Stephens details our still-evolving understanding of sadness -- and even makes a case for its usefulness. Lesson by Courtney Stephens, animation by Sharon Colman Graham. Learn more about your ad choices. Visit megaphone.fm/adchoices Learn more about your ad choices. Visit megaphone.fm/adchoices

Explore how bacterial meningitis affects our bodies, why the disease spreads so quickly, and what to do prevent and treat it.Uploaded 19-11-18--In 1987, thousands of people gathered in Saudi Arabia for the annual Hajj pilgrimage. But what started out as a celebration led to a worldwide health crisis: more than 2,000 cases of meningitis broke out, spreading across Saudi Arabia and the rest of the world. How did it spread so quickly and what makes meningitis so dangerous? Melvin Sanicas examines how the disease affects our bodies. Lesson by Melvin Sanicas, directed by CUB Animation Studio. Support Our Non-Profit Mission----------------------------------------------Support us on Patreon: http://bit.ly/TEDEdPatreonCheck out our merch: http://bit.ly/TEDEDShop----------------------------------------------Connect With Us----------------------------------------------Sign up for our newsletter: http://bit.ly/TEDEdNewsletterFollow us on Facebook: http://bit.ly/TEDEdFacebookFind us on Twitter:…