The Moon has no atmosphere, so the sky appears completely black from its surface even in daytime.

The human body contains about 206 bones.

Fact #267 · Human Body

Giraffes have high blood pressure to pump blood to their brains.

Fact #1250 · Human Body

The dragonfish has bioluminescent organs along its body.

Fact #1404 · Human Body

The Earth completes one full rotation approximately every 24 hours.

Fact #153 · Human Body

Cats have a reflective layer in their eyes that improves night vision.

Fact #1367 · Human Body

A giraffe's heart can weigh over 20 pounds.

Fact #447 · Human Body

Certain parrots can learn to mimic human speech.

Fact #1258 · Human Body

The Thirty Years’ War affected much of Central Europe.

Fact #1171 · Human Body