Tardigrades are practically invincible on Earth, so scientists looked to outer space in search of their kryptonite.

Theorists of consciousness generally focus on sensation – what it's like to, say, experience the color red. Yet what we call the stream of consciousness offers a much richer and more complex blend of ...

Black holes that turn matter into energy could explain dark energy and answer two other cosmic questions. Now, the challenge ...

Here's a thought experiment that keeps planetary scientists awake at night. Strip every living thing from our planet, every bacterium, every blade of grass, every creature that has ever drawn breath ...