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Did you know?
The familiar sounds of your heart are made by the heart's valves as they open and close.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
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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.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.