Have you ever wondered why you look up and see a dark sky at night?

The Limb of the Sun

Are These Butterflies The Same?

It has NO EDGE. And NO CENTER... or does it?

Plate Tectonics Explained

The Milky Way is often described as measuring 100,000 light years across and containing the mass of a trillion Suns. But our home galaxy is actually far bigger, and might be much less massive. Astronomers aren't sure what the exact stats...

We know that glass is fragile - that's like, it's main thing. But research is working on improving how we make glass to make it unbreakable, or at least as close as we can get. Here's the latest on how to make truly shatterproof glass!

Occasionally, a volcano coughs up a ring of fog. How does it create that whimsical shape, and how similar is it to the smoke rings humans can make?<br/>

Winning an alpine skiing race can come down to a tiny margin, so the skiers have to make sure they prepare their skis just right!

Taylor Branch, author of "At Canaan's Edge", the final installment of his three-volume biography of Martin Luther King Jr., discusses the civil rights leader's life and legacy.

Antarctica's Larsen Ice Shelf is disappearing section by section. A fast-growing rift, one of the largest ever seen, is now teetering on the edge of breaking away from the glacier. Science correspondent Miles O'Brien explores how...

In the Greek island village of Antio, home to the world's most endangered

language, aging residents communicate across hillsides through whistle
s, a
specific system of communication believed to date back to Ancien
t Greece....

Imagine you have a square-shaped room, and inside there is an assassin and a target. And suppose that any shot that the assassin takes can ricochet off the walls of the room, just like a ball on a billiard table. Is it possible to...

What is Pick's Theorem and how can we prove it?

An information puzzle with an interesting twist

To thrive in today's competitive economy, you need to constantly reimagine your business. So what's the secret to sustained success? Strategist Martin Reeves makes a pitch for embracing play to spark innovative business ideas -- and...

In the first of a new TED-Ed series designed to catalyze curiosity, TED Curator Chris Anderson shares his boyhood obsession with quirky questions that seem to have no answers.

How do you defeat a creature that grows two heads for every one head you chop off? You do the math.

At one time, Wolverine served on four different superhero teams. How did he do it? He may have used graph coloring.

What weird worlds are these video games creating?

Most animals with a backbone possess a tail, and they use them for all sorts of purposes. There isn’t just one reason for having a tail, it all depends on what the animal is adapted for.

Imagine you have four cubes, whose faces are colored red, blue, yellow, and green. Can you stack these cubes so that each color appears exactly once on each of the four sides of the stack?

Astronomers have found a Hot Jupiter - WASP-121b - that is leaking metal, and put together a new 3D map of the Milky Way showing that our galaxy is actually a bit twisted!

This is an absolutely beautiful piece of math. It shows how certain ideas from topology, such as the mobius strip, can be used to solve a slightly softer form of an unsolved problem in geometry.