Archaeologists sometimes use sound waves to help them find objects at underwater sites.

When you move faster in space, you move slower in time.

Identical twins have the exact same genes, but their fingerprints are unique.

Bats are the only mammals that can truly fly.

The primate cortex is so large that it has to be folded to fit inside the skull. That's why the surface of the brain is wrinkly.

Scientists think that dinosaurs might have been brightly colored, like many modern-day birds and reptiles.

Fireflies aren't flies at all. They're beetles!

Many sauropods grew new teeth as often as once a month, as old ones wore out.

Antarctica is a continent surrounded by ocean. The Arctic is the opposite, an expanse of ocean surrounded by continents.

If melted, the ice sheets covering Antarctica would raise global sea level by almost 70 meters (230 feet).