Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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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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There are more sensory neurons in the tongue than in any other part of the body.
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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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The familiar sounds of your heart are made by the heart's valves as they open and close.