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.
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