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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.