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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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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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A headache when you wake up in the morning is indicative of sinusitis. Other symptoms of sinusitis can include fever, weakness, tiredness, a cough that may be more severe at night, and a runny nose or nasal congestion.
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The horizontal fraction bar was introduced by the Arabs.