Canned food was invented before the can opener — for 50 years, cans had to be opened with a hammer and chisel.

The human body contains trillions of cells.

Fact #90 · Human Body

Atmospheric rivers can deliver massive amounts of rainfall.

Fact #845 · Human Body

Smiling can influence mood through feedback to the brain.

Fact #951 · Human Body

The human brain weighs about three pounds on average.

Fact #244 · Human Body

Ankylosaurs had armored bodies and clubbed tails.

Fact #629 · Human Body

The barreleye fish has a transparent head and upward-facing eyes.

Fact #1390 · Human Body

The human eye can detect a single photon.

Fact #1706 · Human Body

A dog’s nose print is unique, similar to a human fingerprint.

Fact #1347 · Human Body