If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Cyanide works by making the human body unable to use oxygen.
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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
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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.