Can you solve the prisoner hat riddle? - Alex Gendler

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View full lesson: http://ed.ted.com/lessons/can-you-solve-the-prisoner-hat-riddle-alex-gendler

Want more? Try the buried treasure riddle: https://www.youtube.com/watch?v=tCeklW2e6_E

You and nine other individuals have been captured by super-intelligent alien overlords. The aliens think humans look quite tasty, but their civilization forbids eating highly logical and cooperative beings. Unfortunately, they’re not sure whether you qualify, so they decide to give you all a test. Can you solve this hat riddle? Alex Gendler shows how.

Lesson by Alex Gendler, animation by Artrake Studio.

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Can you solve the temple riddle? - Dennis E. Shasha

Can you solve the temple riddle? - Dennis E. Shasha

View full lesson: http://ed.ted.com/lessons/can-you-solve-the-temple-riddle-dennis-e-shasha

Your expedition finally stands at the heart of the ancient temple. But as you study the inscriptions in the darkness, two wisps of green smoke burst forth. The walls begin to shake. The giant sandglass begins flowing with less than an hour before it empties, and a rumbling tells you that you don’t want to be around when that happens. Can you use math to escape the temple? Dennis E. Shasha shows how.

Lesson by Dennis E. Shasha, animation by Artrake Studio.
Why do animals have such different lifespans? - Joao Pedro de Magalhaes

Why do animals have such different lifespans? - Joao Pedro de Magalhaes

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View full lesson: http://ed.ted.com/lessons/why-do-animals-have-such-different-lifespans-joao-pedro-de-magalhaes

For the microscopic lab worm C. elegans, life equates to just a few short weeks on Earth. The bowhead whale, on the other hand, can live over two hundred years. Why are these lifespans so different? And what does it really mean to ‘age' anyway? Joao Pedro de Magalhaes explains why the pace of aging varies greatly across animals.

Lesson by Joao Pedro de Magalhaes, animation by Sharon Colman.
Why don't perpetual motion machines ever work? - Netta Schramm

Why don't perpetual motion machines ever work? - Netta Schramm

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View full lesson: http://ed.ted.com/lessons/why-don-t-perpetual-motion-machines-ever-work-netta-schramm

Perpetual motion machines — devices that can do work indefinitely without any external energy source — have captured many inventors’ imaginations because they could totally transform our relationship with energy. There’s just one problem: they don’t work. Why not? Netta Schramm describes the pitfalls of perpetual motion machines.

Lesson by Netta Schramm, animation by TED-Ed.
How to defeat a dragon with math - Garth Sundem

How to defeat a dragon with math - Garth Sundem

View full lesson: http://ed.ted.com/lessons/how-to-defeat-a-dragon-with-math-garth-sundem

Having trouble remembering the order of operations? Let's raise the stakes a little bit. What if the future of your (theoretical) kingdom depended on it? Garth Sundem creates a world in which PEMDAS is the hero but only heroic when in the proper order.

Lesson by Garth Sundem, animation by Mark Phillips.