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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
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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.