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Vaccines prevent between 2.5 and 4 million deaths every year.
Did you know?
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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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.