An ophthalmologist explains how important tears are to keeping your eyes feeling good and working well – whether you’re on dry land or swimming in a body of water.

You’re not allowed to visit the part of Nevada known as Area 51. That’s because it’s a top-secret government facility. But the secrecy has to do with spy planes, not space aliens.

To find out what is beyond space, a good place to start would be to figure out where space – our universe – ends.

Math is more than memorizing times tables and doing homework problems. It is woven into more aspects of your life than you might think.

Some people incorrectly say the Moon landings didn’t happen. But the evidence – and logic – isn’t on their side.

Your brains can perceive some electromagnetic waves – but not without your body’s help.

You can squash small bugs by stepping on them, but can you crush even tinier microorganisms like viruses and bacteria? It turns out that you’d need to apply a lot of pressure.

Humans have figured out how to season their food with virtually every part of plants.

Maybe it was a nuclear war, devastating climate change, or a killer virus. But if something caused people to disappear, imagine what would happen afterward.

From fluffy crabs that wear sea sponge hats to worms that glow in the dark, scientists are constantly finding amazing new life forms in the ocean.