What gives opals their signature shimmering colors? Dig into the science of the gemstone’s formation, millions of years in the making.

Explore the incredible adaptations of Elysia chlorotica, a species of sea slug that can photosynthesize food.

During an Arctic expedition, naval officer Richard Burn makes a very unusual discovery, in this clip from Season 18, "Secrets of Inner Earth."

Excavators at the La Brea Tar Pits and Museum work to dig up fossils of mammoths, dire wolves, giant sloths and more out of the ground.

A thought experiment in quantum mechanics. Austrian physicist Erwin Schrödinger, one of the founders of quantum mechanics, posed this famous question: If you put a cat in a sealed box with a device that has a 50% chance of killing the cat in the next hou...

Why is grass green? Lets talk about Chlorophyll, Alien Plants and get down to why grass is really green!

There are three types of color receptors in your eye: red, green and blue. But how do we see the amazing kaleidoscope of other colors that make up our world? Colm Kelleher explains how humans can see everything from auburn to aquamarine.

Can we accurately describe light as exclusively a wave or just a particle? Are the two mutually exclusive? In this third part of his series on light and color, Colm Kelleher discusses wave-particle duality and its relationship to how we see light and, the...

If you were to take a coffee cup, and break it in half, then in half again, and keep carrying on, where would you end up? Could you keep on going forever? Or would you eventually find a set of indivisible building blocks out of which everything is made? J...

Just how small are atoms? And what's inside them? The answers turn out to be astounding, even for those who think they know. This fast-paced animation uses spectacular metaphors (imagine a blueberry the size of a football stadium!) to give a visceral sens...

The myth of the Minotaur tells the story of an enraged beast forever wandering the corridors of a damp labyrinth, filled with a rage so intense that its deafening roar shakes the earth. But is this story just fiction, or an attempt of our early ancestors...

Sitting around a campfire, you can feel its heat, smell the woody smoke, and hear it crackle. If you get too close, it burns your eyes and stings your nostrils. You could stare at the bright flames forever as they twist and flicker in endless incarnations...

What makes crystals grow into their signature shapes? Dig into the atomic patterns and unique properties of crystals.

Does everyone have an unrelated twin? It turns out doppelgangers are more common then you'd think, and relate to how consciousness works! Thank you community for helping me FIND SCOTT HOYING, MY LONG LOST BROTHER!!!!

What Was The "Boring Billion" Really Like?