TED-Ed

Get to know the life of Mexican nun, poet and scholar, Sor Juana Inés de la Cruz, who was censored by the Church for her critical writings. --Juana Ramírez de Asbaje sat before a panel of prestigious theologians, jurists, and mathematicians. They had been invited to test Juana’s knowledge with the most difficult questions they could muster. But she successfully answered every challenge, from compl...

View full lesson: http://ed.ted.com/lessons/how-languages-evolve-alex-gendlerOver the course of human history, thousands of languages have developed from what was once a much smaller number. How did we end up with so many? And how do we keep track of them all? Alex Gendler explains how linguists group languages into language families, demonstrating how these linguistic trees give us crucial insigh...

Why, why, why does our education system look so similar to the way it did 50 years ago? Millions of students were failing then, as they are now -- and it's because we're clinging to a business model that clearly doesn't work. Education advocate Geoffrey Canada dares the system to look at the data, think about the customers and make systematic shifts in order to help greater numbers of kids excel....

Dig into the science and superstition behind the myth of vampires, and how it has persisted from ancient Mesopotamia to today.--The myth of the bloodsucking vampire has stalked humans from ancient Mesopotamia to 18th-century Eastern Europe, but it has differed in the terrifying details. So, how did we arrive at the popular image we know, love and fear today? And what truly makes a vampire...a vamp...

An animated interpretation of Tim Seibles' poem "First Kiss"--Watch an interview with the poet here: https://www.youtube.com/watch?v=Xiv3kKHpwk4This animation is part of our series, "There's a Poem for That," which features animated interpretations of poems both old and new that give language to some of life's biggest feelings. Check out the full series here: http://bit.ly/TEDEdTheresAPoemForThatP...

Bernie Krause has been recording wild soundscapes -- the wind in the trees, the chirping of birds, the subtle sounds of insect larvae -- for 45 years. In that time, he has seen many environments radically altered by humans, sometimes even by practices thought to be environmentally safe. A surprising look at what we can learn through nature's symphonies, from the grunting of a sea anemone to the sa...

View full lesson: http://ed.ted.com/lessons/a-digital-reimagining-of-gettysburg-anne-knowlesGeographer Anne Knowles uses digital technologies to reimagine the past. In this fascinating talk, Knowles transports us to the Battle of Gettysburg, the turning point of the Civil War. Using Geographic Information Systems (GIS) and historical maps, she traces the footsteps of Robert E. Lee as he orders Pic...

Download a free audiobook version of "The Three-Body Problem" and support TED-Ed's nonprofit mission: https://www.audible.com/ted-ed --In 2009, researchers ran a simple experiment. They took everything we know about our solar system and calculated where every planet would be up to 5 billion years in the future. They ran over 2,000 simulations, and the astonishing variety in results revealed that o...

Explore the psychology of the cognitive bias known as the conjunction fallacy, where we assume specific conditions are more probable than general ones. --Meet Lucy. She was a math major in college, and aced all her courses in probability and statistics. Which do you think is more likely: that Lucy is a portrait artist, or that Lucy is a portrait artist who also plays poker? How do we know which st...

Dive into the Irish myth of Táin Bò Cuailnge, where Queen Meadhbh of Connaught seeks to capture the fabled brown bull of Ulster. --Cú Chulainn, hero of Ulster, stood at the ford at Cooley, ready to face an entire army single handedly— all for the sake of a single bull. The army in question belonged to Queen Meadhbh of Connaught. Enraged at her husband’s possession of a white bull of awesome streng...

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

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. Talk by Bill Gates. Learn more about your ad choices. Visit megaphone.fm/adchoices

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

View full lesson: http://ed.ted.com/lessons/the-fundamentals-of-space-time-part-3-andrew-pontzen-and-tom-whyntieView part 1: http://ed.ted.com/lessons/the-fundamentals-of-space-time-part-1-andrew-pontzen-and-tom-whyntieView part 2: http://ed.ted.com/lessons/the-fundamentals-of-space-time-part-2-andrew-pontzen-and-tom-whyntieIn the first two lessons of this series on space-time, we've dealt with ob...

You don't need to plan an exotic trip to find creative inspiration. Just look up, says Gavin Pretor-Pinney, founder of the Cloud Appreciation Society. As he shares charming photos of nature's finest aerial architecture, Pretor-Pinney calls for us all to take a step off the digital treadmill, lie back and admire the beauty in the sky above. Talk by Gavin Pretor-Pinney. Learn more about your ad choi...

Dig into the false cause fallacy, which assumes that one event causes another, and learn how to distinguish between correlation and causation.--It’s 1843, and a debate is raging about one of the most common killers of women: childbed fever— no one knows what causes it. One physician has observed patients with inflammation go on to develop childbed fever, and therefore believes the inflammation cau...

Discover the quirky creature known as the parrotfish, and the key role it plays in keeping coral reefs healthy and thriving. --As the sun rises over a quiet coral reef, one animal breaks the morning silence. Named for its vibrant scales and beak-like teeth, the parrotfish devours a particularly crunchy breakfast: rocks. Why would any creature take bites out of the seafloor? Mike Gil explores how t...

View full lesson: http://ed.ted.com/lessons/the-strengths-and-weaknesses-of-acids-and-bases-george-zaidan-and-charles-mortonVinegar may have a powerful smell, but did you know it's actually a weak acid? In the chemical economy, acids actively give away their protons while bases actively collect them -- but some more aggressively than others. George Zaidan and Charles Morton use the currency of sub...

View full lesson: http://ed.ted.com/lessons/how-we-conquered-the-deadly-smallpox-virus-simona-zompiFor 10,000 years, humanity suffered from the scourge of smallpox. The virus killed almost a third of its victims within two weeks and left survivors horribly scarred. But Simona Zompi commends the brave souls -- a Buddhist nun, a boy, a cow, a dairymaid and physician Edward Jenner -- who first stoppe...

Explore the ancient methods of growing glaciers, the homemade bodies of ice used as water sources, and how they can be used to combat climate change. --In the 13th century, Genghis Khan embarked on a mission to take over Eurasia, swiftly conquering countries and drawing them into his empire. But, legend has it that there was one obstacle that even he couldn’t overcome: a towering wall of ice, grow...

Building a skyscraper? Forget about steel and concrete, says architect Michael Green, and build it out of ... wood. As he details in this intriguing talk, it's not only possible to build safe wooden structures up to 30 stories tall (and, he hopes, higher), it's necessary. Talk by Michael Green. Learn more about your ad choices. Visit megaphone.fm/adchoices

Explore how marijuana’s two main active compounds, THC and CBD, affect your brain and body, and what risk factors to watch out for. --In 1970, marijuana was classified as a schedule 1 drug in the United States: the strictest designation possible, meaning it was completely illegal and had no recognized medical uses. Today, marijuana’s therapeutic benefits are widely acknowledged, but a growing reco...

View full lesson: http://ed.ted.com/lessons/how-the-heart-actually-pumps-blood-edmond-huiFor most of history, scientists weren't quite sure why our hearts were beating or even what purpose they served. Eventually, we realized that these thumping organs serve the vital task of pumping clean blood throughout the body. But how? Edmond Hui investigates how it all works by taking a closer look at the h...

Practice more problem-solving at https://brilliant.org/TedEd/--You’re the chief advisor to an eccentric king who needs to declare his successor. He wants his heir to be good at arithmetic, lucky, and above all else, honest. So he’s devised a competition to test his children, and ordered you to choose the winner. The future of the kingdom is in your hands. Can you find the worthiest successor? Dan...

Take a look at the theories behind why earthquakes occur, what makes them so hard to predict and the warning system technologies we rely on today. --In 132 CE, Zhang Heng presented his latest invention: a large vase he claimed could tell them whenever an earthquake occurred for hundreds of miles. Today, we no longer rely on pots as warning systems, but earthquakes still offer challenges to those t...