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The average adult has about 21 square feet of skin.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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Your heart beats over 36 million times a year.
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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.