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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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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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Your heart beats over 36 million times a year.
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Medication errors are more common among seriously ill patients than with those with minor conditions.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").