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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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The human body produces and destroys 15 million blood cells every second.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.
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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.