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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The longest a person has survived after a heart transplant is 24 years.
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To combat osteoporosis, changes in lifestyle and diet are recommended. At-risk patients should include 1,200 to 1,500 mg of calcium daily either via dietary means or with supplements.
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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.