Approximately 500,000 babies are born each year in the United States to teenage mothers.
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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
Several common functional groups in a single biomolecule