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Your heart beats over 36 million times a year.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.

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In 1864, the first barbiturate (barbituric acid) was synthesized.

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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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