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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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Vaccines prevent between 2.5 and 4 million deaths every year.
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On average, the stomach produces 2 L of hydrochloric acid per day.
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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 most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.