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Approximately 500,000 babies are born each year in the United States to teenage mothers.
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The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.