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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.