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Your heart beats over 36 million times a year.
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There are more bacteria in your mouth than there are people in the world.
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Hyperthyroidism leads to an increased rate of metabolism and affects about 1% of women but only 0.1% of men. For most people, this increased metabolic rate causes the thyroid gland to become enlarged (known as a goiter).
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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.