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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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Approximately 70% of expectant mothers report experiencing some symptoms of morning sickness during the first trimester of pregnancy.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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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.