The average person has about 100,000 hairs on their head.

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

Fact #773 · Human Body

Many insects have exoskeletons that protect them from dehydration.

Fact #876 · Human Body

The Sumerians developed one of the earliest known writing systems.

Fact #644 · Human Body

Water is the only natural substance that commonly exists as a solid, liquid, and gas on Earth.

Fact #175 · Human Body

The Earth's inner core is primarily iron and nickel.

Fact #150 · Human Body

Stress hormones prepare the body for a fight-or-flight response.

Fact #959 · Human Body

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

Fact #1189 · Human Body

The fangtooth fish has some of the largest teeth relative to body size in the ocean.

Fact #1392 · Human Body