Fun Science Facts

The earliest cockroach fossils are about 280 million years old.

Healthy nails grow about 2 cm each year. Fingernails grow four times as fast as toenails.

20/20 vision means the eye can see normally at 20 feet. 20/15 is better; the eye can see at 20 feet what another eye sees at 15 feet.

The average person has 100,000 hairs on his/her head. Each hair grows about 5 inches (12.7 cm) every year.

There are 60,000 miles (97,000 km) in blood vessels in every human.