Can you solve the prisoner hat riddle?

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. […]

Building the World’s Largest Telescope (And its Mirrors!)

Underneath the University of Arizona’s football stadium are the beginnings of the Giant Magellan Telescope, set to be the largest optical telescope in the world. The Richard F. Caris Mirror Laboratory is the only place equipped to manufacture gigantic 27-foot tall mirrors, the kind needed to build the heart of the Magellan. Each of the […]

How Transistors Work [Science Video]

Modern computers are revolutionizing our lives, performing tasks unimaginable only decades ago. This was made possible by a long series of innovations, but there’s one foundational invention that almost everything else relies upon: the transistor. Gokul J. Krishnan describes what a transistor is and how this small device enables all the amazing things computers can […]