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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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The human body produces and destroys 15 million blood cells every second.
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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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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).