A day on Mars is only a little longer than a day on Earth.

Humans share their birthday with millions of other people around the world.

Mount Everest is the tallest mountain above sea level.

Scientists learn about dinosaurs by studying fossils — bones and footprints turned to stone.

Bananas grow in bunches called "hands", and each banana is a "finger".

Your inner ear helps you hear and also helps you keep your balance.

A single cloud can weigh as much as a hundred elephants.