Stars twinkle because their light bends as it passes through Earth's moving air.

Your tongue print is unique, just like your fingerprint.

Rainbows are actually full circles — we usually only see half because the ground gets in the way.

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.