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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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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.