Did you know that Fingernails grow four times as fast as toenails?

The oldest known fossil is of a single-celled organism, blue-green algae, found in 3.2 billion year-old stones in South Africa.

The oldest multicellular fossils date from ~700 million years ago.

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.