The human nose can detect over 1 trillion different smells — not the previously estimated 10,000.

Some birds have hollow bones to reduce body weight for flight.

Fact #889 · Human Body

A polar bear’s sense of smell is extremely powerful.

Fact #486 · Human Body

In 1920, a town in Minnesota briefly elected a bear as mayor in a publicity stunt.

Fact #773 · Human Body

Certain parrots can learn to mimic human speech.

Fact #1258 · Human Body

The Earth's interior is layered into crust, mantle, and core.

Fact #338 · Human Body

The human body has over 600 muscles.

Fact #160 · Human Body

Mammoths and early humans lived at the same time.

Fact #633 · Human Body

Curiosity can enhance learning and memory retention.

Fact #973 · Human Body