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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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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.