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There are more nerve cells in one human brain than there are stars in the Milky Way.
Approximately 500,000 babies are born each year in the United States to teenage mothers.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
The U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.
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