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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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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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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.