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Vampire bats have a natural anticoagulant in their saliva that permits continuous bleeding after they painlessly open a wound with their incisors. This capillary blood does not cause any significant blood loss to their victims.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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On average, the stomach produces 2 L of hydrochloric acid per day.