Apples float in water because they are about 25% air.

About 71% of Earth's surface is covered by water.

Some dinosaurs had feathers.

Ancient Egyptians used to play board games — one was called Senet.

Popcorn pops because of a tiny drop of water inside each kernel that turns to steam.

Sea turtles have been around since the time of the dinosaurs.

Bats are the only mammals that can truly fly.