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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The average adult has about 21 square feet of skin.
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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Bisphosphonates were first developed in the nineteenth century. They were first investigated for use in disorders of bone metabolism in the 1960s. They are now used clinically for the treatment of osteoporosis, Paget's disease, bone metastasis, multiple myeloma, and other conditions that feature bone fragility.