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Did you know?
Your heart beats over 36 million times a year.
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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 horizontal fraction bar was introduced by the Arabs.
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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 human body produces and destroys 15 million blood cells every second.