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About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.
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Signs of depression include feeling sad most of the time for 2 weeks or longer; loss of interest in things normally enjoyed; lack of energy; sleep and appetite disturbances; weight changes; feelings of hopelessness, helplessness, or worthlessness; an inability to make decisions; and thoughts of death and suicide.
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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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There are 60,000 miles of blood vessels in every adult human.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.