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Did you know?
Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
Did you know?
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.

