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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).
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Your heart beats over 36 million times a year.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").