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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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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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Anti-aging claims should not ever be believed. There is no supplement, medication, or any other substance that has been proven to slow or stop the aging process.
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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.
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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.