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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
It is difficult to obtain enough calcium without consuming milk or other dairy foods.
In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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