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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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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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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.