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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.
People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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).