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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The average office desk has 400 times more bacteria on it than a toilet.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.