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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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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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Vaccines prevent between 2.5 and 4 million deaths every year.