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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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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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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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The average adult has about 21 square feet of skin.
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The familiar sounds of your heart are made by the heart's valves as they open and close.