History vs. Augustus – Peta Greenfield & Alex Gendler

From TED Ed. Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/history-vs-augustus-alex-gendler-and-peta-greenfield His reign marked the beginning of one of history’s greatest empires … and the end of one of its first republics. Was Rome’s first emperor a visionary leader who guaranteed his civilization’s place in history, or a tyrant who destroyed its core…

What is the coldest thing in the world? – Lina Marieth Hoyos

From TED Ed. Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/what-is-the-coldest-thing-in-the-world-lina-marieth-hoyos The coldest materials in the world aren’t in Antarctica or at the top of Mount Everest. They’re in physics labs: clouds of gases held just fractions of a degree above absolute zero. Lina Marieth Hoyos explains how temperatures this low give scientists…

Why don’t poisonous animals poison themselves? – Rebecca D. Tarvin

From TED Ed. Have you checked out our Patreon page? https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/why-don-t-poisonous-animals-poison-themselves-rebecca-d-tarvin Thousands of animal species use toxic chemicals to defend themselves from would-be predators. Snakes have blood clotting compounds in their fangs, the bombardier beetle has corrosive liquid in its abdomen and jellyfish have venomous, harpoon-like tentacles. But how do these…

Are there universal expressions of emotion? – Sophie Zadeh

From TED Ed. Learn more about TED-Ed Clubs here: http://bit.ly/2z8YFSo View full lesson: https://ed.ted.com/lessons/are-there-universal-expressions-of-emotion-sophie-zadeh The 40 or so muscles in the human face can be activated in different combinations to create thousands of expressions. But do these expressions look the same and communicate the same meaning around the world regardless of culture? Is one person’s…

What causes hallucinations? – Elizabeth Cox

From TED Ed. Download a free audiobook version of “Hallucinations” and support TED-Ed’s nonprofit mission: https://adbl.co/2Kpt43k Check out our full book recommendation: https://shop.ed.ted.com/products/hallucinations View full lesson: https://ed.ted.com/lessons/what-causes-hallucinations-elizabeth-cox A condition called Charles Bonnet Syndrome can cause blind patients to hallucinate scenes in vivid color. fMRI studies show that these hallucinations activate the same brain area as…

The psychology of post-traumatic stress disorder – Joelle Rabow Maletis

From TED Ed. View full lesson: https://ed.ted.com/lessons/the-psychology-of-post-traumatic-stress-disorder-joelle-maletis Many of us will experience some kind of trauma during our lifetime. Sometimes, we escape with no long-term effects. But for millions of people, those experiences linger, causing symptoms like flashbacks, nightmares, and negative thoughts that interfere with everyday life. Joelle Rabow Maletis details the science behind post-traumatic…

How do your hormones work? – Emma Bryce

From TED Ed. Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/how-do-your-hormones-work-emma-bryce Over our lifetimes, our bodies undergo a series of extraordinary metamorphoses: we grow, experience puberty, and many of us reproduce. Behind the scenes, the endocrine system works constantly to orchestrate these changes. Emma Bryce explains how this system regulates everything from your…

Did the Amazons really exist? – Adrienne Mayor

From TED Ed. Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/did-the-amazons-really-exist-adrienne-mayor It was long assumed that Amazons, the fierce and fearsome women warriors of Greece, were imaginary. But curiously enough, stories from ancient Egypt, Persia, the Middle East, Central Asia, India and China also featured Amazon-like warrior women. And Amazons were described in…

The Irish myth of the Giant’s Causeway – Iseult Gillespie

From TED Ed. Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/the-irish-myth-of-the-giant-s-causeway-iseult-gillespie On the coast of Northern Ireland, a vast plateau of basalt slabs and columns called the Giant’s Causeway stretches into the ocean. The scientific explanation for this is that it’s the result of molten lava contracting and fracturing as it cooled in…

Can you solve the penniless pilgrim riddle? – Daniel Finkel

From TED Ed. If you enjoy our riddles, we highly recommend reading “The Number Devil”: https://amzn.to/2JgrAEH Check out our book rec page to learn more: http://bit.ly/2JqwgLE View full lesson: https://ed.ted.com/lessons/can-you-solve-the-penniless-pilgrim-riddle-daniel-finkel After months of travel, you’ve arrived at Duonia, home to the famous temple that’s the destination of your pilgrimage. The walk from the welcome center…

Why is it so hard to cure ALS? – Fernando G. Vieira

From TED Ed. Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/why-is-it-so-hard-to-cure-als-fernando-vieira Amyotrophic Lateral Sclerosis (ALS), also called motor neuron disease and Lou Gehrig’s Disease, affects about two out of every 100,000 people worldwide. When a person has ALS, their motor neurons – the cells responsible for all voluntary muscle control in the body…

Are naked mole rats the strangest mammals? – Thomas Park

From TED Ed. Visit TED-Ed’s shop to pick up t-shirts, totes, mugs and more featuring characters from your favorite TED-Ed Animations: http://bit.ly/2IWAKWE View full lesson: https://ed.ted.com/lessons/are-naked-mole-rats-the-strangest-mammals-thomas-park What mammal has the social life of an insect, the cold-bloodedness of a reptile, and the metabolism of a plant? Bald and buck-toothed, naked mole-rats may not be pretty,…

How to avoid choking under pressure – Noa Kageyama and Pen-Pen Chen

From TED Ed. Download a free audiobook and support TED-Ed’s nonprofit mission: https://adbl.co/2Lf9Pa2 View full lesson: https://ed.ted.com/lessons/how-to-avoid-choking-under-pressure-noa-kageyama-and-pen-pen-chen Your favorite athlete closes in for a win; the crowd holds its breath, and at the crucial moment … she misses the shot. That competitor just experienced the phenomenon known as “choking,” where despite months, even years, of…

The journey to Pluto, the farthest world ever explored – Alan Stern

From TED Ed. Check out Alan Stern’s “Chasing New Horizons”: https://shop.ed.ted.com/collections/ted-ed-book-recommendations/products/chasing-new-horizons View full lesson: https://ed.ted.com/lessons/the-journey-to-pluto-the-farthest-world-ever-explored-alan-stern As of 1989, mankind had successfully sent craft to every known planet in the solar system except one: Pluto. Located in an mysterious region called the Kuiper Belt, Pluto is a scientific goldmine, and could hold clues to the formation…

How squids outsmart their predators – Carly Anne York

From TED Ed. Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/how-squids-outsmart-their-predators-carly-anne-york There are about 500 species of squid, and they live in all the world’s oceans, making them a reliable food source for whales, dolphins, sharks, seabirds, fish – and even other squid. As a result, the squid’s most extraordinary adaptations are those…

When will the next ice age happen? – Lorraine Lisiecki

From TED Ed. Learn more about TED-Ed Clubs here: https://ed.ted.com/clubs Check out the TED-Ed Clubs YouTube channel: https://www.youtube.com/channel/UCskU_g7t6b5ecsA1CTS3y9Q View full lesson: https://ed.ted.com/lessons/when-will-the-next-ice-age-happen-lorraine-lisiecki Throughout Earth’s history, climate has varied greatly. For hundreds of millions of years, the planet had no polar ice caps. Without this ice, the sea level was 70 meters higher. At the other…

What’s the difference between hibernation and sleep? – Sheena Lee Faherty

From TED Ed. Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/what-s-the-difference-between-hibernation-and-sleep-sheena-faherty The Arctic Ground Squirrel hibernates by burrowing under the permafrost and slipping into a state of suspended animation. The female black bear can give birth while she hibernates. The fat-tailed dwarf lemur prepares to hibernate by storing its fat reserves in its…

How to build a dark matter detector – Jenna Saffin

From TED Ed. Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/how-to-build-a-dark-matter-detector-jenna-saffin More than 2 kilometers below the surface of northern Ontario, suspended in 345,000 liters of ultra-pure water, there’s a perfect sphere. Scientists continuously monitor this chamber, looking for a glimmer of light in the darkness. Why? Because that light would indicate the…

How do we study living brains? – John Borghi and Elizabeth Waters

From TED Ed. Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/how-do-we-study-living-brains-john-borghi-and-elizabeth-waters As far as we know, there’s only one thing in our solar system sophisticated enough to study itself: the human brain. But this self-investigation is challenging because a living brain is shielded by skull, swaddled in tissue, and made up of billions…

The rise and fall of the Assyrian Empire – Marian H Feldman

From TED Ed. Check out our Patreon page: https://www.patreon.com/teded View full lesson: https://ed.ted.com/lessons/the-rise-and-fall-of-the-assyrian-empire-marian-h-feldman Before the sun never set on the British Empire; before Genghis Khan swept the steppe; before Rome extended its influence to encircle the Mediterranean Sea; there was ancient Assyria. Considered by historians to be the first true empire, Assyria’s innovations laid the…

How the world’s first subway system was built – Christian Wolmar

From TED Ed. Learn more about our student voice program, TED-Ed Clubs: http://bit.ly/2J5g4eS 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…