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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.

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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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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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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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