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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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Thyroid conditions may make getting pregnant impossible.
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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.