The Caesar cipher, a secret code, is named after Julius Caesar, who used it over 2,000 years ago.

A single little brown bat can catch hundreds of insects in one hour.

Some snails can stay sealed up and resting for months when the weather is very dry.

Elephants can't jump. They always keep at least one foot on the ground.

A shrimp's heart is in its head.

Polar bears have black skin under their white fur.

Jupiter is so big that all the other planets could fit inside it.