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.
An Astronaut can be up to 2 inches taller returning from space. The cartilage disks in the spine expand in the absence of gravity.
Rats multiply so quickly that in 18 months, two rats could have over 1 million descendents.
Elephants have been known to remain standing after they die.
Ants do not sleep.
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