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

The Olympic Games are held every four years.

Fact #923 · Human Body

Tyrannosaurus rex had teeth that could grow over 12 inches long.

Fact #619 · Human Body

Practice can strengthen neural pathways in the brain.

Fact #968 · Human Body

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

Fact #889 · Human Body

Water covers more than 70% of Earth's surface.

Fact #86 · Human Body

Some animals can regenerate entire body parts.

Fact #1740 · Human Body

Octopuses have three hearts and blue blood.

Fact #1 · Human Body

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

Fact #1512 · Human Body