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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
The average adult has about 21 square feet of skin.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
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