2222 Videos
What’s the fastest way to alphabetize your bookshelf? – Chand John

What’s the fastest way to alphabetize your bookshelf? – Chand John

View full lesson: You work at the college library. You’re in the middle of a quiet afternoon when suddenly, a shipment of 1,280 books arrives. The books are in a straight line, but they’re all out of order, and the automatic sorting system is broken. How can you sort the books quickly? Chand John […]
What’s Wrong with These Signs? Signs: Bathroom Etiquette

Why do people have seasonal allergies? – Eleanor Nelsen

View full lesson: Ah, spring. Grass growing, flowers blooming, trees budding. For those with allergies, though, this explosion of new life probably inspires more dread than joy. So what’s behind this annual onslaught of mucus? Eleanor Nelsen explains what happens when your immune system goes rogue. Lesson by Eleanor Nelson, animation by TED-Ed.
What’s Wrong with These Signs? Signs: Bathroom Etiquette

How the Königsberg bridge problem changed mathematics – Dan Van der Vieren

View full lesson: You’d have a hard time finding the medieval city Königsberg on any modern maps, but one particular quirk in its geography has made it one of the most famous cities in mathematics. Dan Van der Vieren explains how grappling with Königsberg’s puzzling seven bridges led famous mathematician Leonhard Euler to invent […]
What’s Wrong with These Signs? Signs: Bathroom Etiquette

This is Sparta: Fierce warriors of the ancient world – Craig Zimmer

View full lesson: In ancient Greece, violent internal conflict between border neighbors and war with foreign invaders was a way of life, and Greeks were considered premier warriors. Sparta, specifically, had an army of the most feared warriors in the ancient world. What were they doing to produce such fierce soldiers? Craig Zimmer shares […]
The mathematical secrets of Pascal’s triangle – Wajdi Mohamed Ratemi

The mathematical secrets of Pascal’s triangle – Wajdi Mohamed Ratemi

View full lesson: Pascal’s triangle, which at first may just look like a neatly arranged stack of numbers, is actually a mathematical treasure trove. But what about it has so intrigued mathematicians the world over? Wajdi Mohamed Ratemi shows how Pascal’s triangle is full of patterns and secrets. Lesson by Wajdi Mohamed Ratemi, animation […]
Life Comes At You Fast

Can you solve “Einstein’s Riddle”? – Dan Van der Vieren

View full lesson: View all the clues here: Before he turned physics upside down, a young Albert Einstein supposedly showed off his genius by devising a complex riddle involving a stolen exotic fish and a long list of suspects. Can you resist tackling a brain teaser written by one of the smartest people […]
Life Comes At You Fast

How people rationalize fraud – Kelly Richmond Pope

View full lesson: If you ask people whether they think stealing is wrong, most of them would answer yes. And yet, in 2013, organizations all over the world lost an estimated total of $3.7 trillion to fraud. Kelly Richmond Pope explains how the fraud triangle, (developed by criminologist Donald Cressey) can help us understand […]
Life Comes At You Fast

How spontaneous brain activity keeps you alive – Nathan S. Jacobs

View full lesson: The wheels in your brain are constantly turning, even when you’re asleep or not paying attention. In fact, most of your brain’s activities are ones you’d never be aware of … unless they suddenly stopped. Nathan S. Jacobs takes us inside the always active, surprisingly spontaneous brain. Lesson by Nathan S. […]
Life Comes At You Fast

Can robots be creative? – Gil Weinberg

View full lesson: People have been grappling with the question of artificial creativity — alongside the question of artificial intelligence — for over 170 years. For instance, could we program machines to create high quality original music? And if we do, is it the machine or the programmer that exhibits creativity? Gil Weinberg investigates […]
Life Comes At You Fast

The great brain debate – Ted Altschuler

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.