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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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.
Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.
Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.


