An octopus has three hearts and blue blood.

Hummingbirds are the only birds that can fly backwards.

A newborn kangaroo is about the size of a jelly bean.

Frogs drink water through their skin.

Saturn could float in a giant bathtub because it is less dense than water.

The International Space Station goes around Earth about 16 times every day.

The strongest muscle for its size in your body is the one you chew with — the jaw muscle.