Social exclusion activates the same brain regions as physical pain — rejection hurts, literally.

Some animals sleep for years.

Fact #1720 · Human Body

Polar bears have black skin beneath their white fur.

Fact #26 · Human Body

Insulin was first used to treat diabetes in the early 1920s.

Fact #1189 · Human Body

Cats can rotate their ears independently.

Fact #1336 · Human Body

The Empire State Building was completed in just over a year.

Fact #1512 · Human Body

Octopuses have three hearts and blue blood.

Fact #1 · Human Body

The human nose can distinguish thousands of different scents.

Fact #107 · Human Body

The hatchetfish has a flattened body adapted to deep water.

Fact #1414 · Human Body