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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
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Thyroid conditions cause a higher risk of fibromyalgia and chronic fatigue syndrome.