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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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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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There are approximately 3 million unintended pregnancies in the United States each year.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.