Fear and excitement produce very similar physical responses.

The Earth's mantle is composed of semi-solid rock.

Fact #329 · Human Body

Learning involves changes in neural connections.

Fact #986 · Human Body

The FIFA World Cup is held every four years.

Fact #930 · Human Body

The Earth's rotation is responsible for the Coriolis effect.

Fact #261 · Human Body

The Olympic Games are held every four years.

Fact #923 · Human Body

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

Fact #889 · Human Body

Camels have specialized red blood cells that help them survive dehydration.

Fact #856 · Human Body

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

Fact #1189 · Human Body