The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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There are 20 feet of blood vessels in each square inch of human skin.
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A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.