Antarctica is the largest desert in the world — deserts are places with very little rain or snow.

Birds are living relatives of dinosaurs.

Ketchup was once sold as a medicine.

Peanuts aren't nuts — they are legumes, like beans.

Owls can turn their heads about three-quarters of the way around.

Snails have thousands of tiny teeth on their tongues.

Mars has two tiny moons named Phobos and Deimos.