The lining in a person's stomach is replaced every 4 to 5 days
to prevent it from digesting itself.
An adult human small intestine is about 18 to 23 feet long,
which is about four times as long as an adult is tall.
Semen normally contains 1-8 billion sperm per fluid ounce
(140-300 million sperm per millimeter).
Feet have about 500,000 sweat glands and can produce about a
pint of sweat a day.
A human sneeze can travel about 100 mph or more.
The average human produces 25,000 quarts of saliva in a
lifetime, enough to fill two swimming pools.
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