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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.