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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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The human body produces and destroys 15 million blood cells every second.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.