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There are more nerve cells in one human brain than there are stars in the Milky Way.
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The horizontal fraction bar was introduced by the Arabs.
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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.