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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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Vaccines prevent between 2.5 and 4 million deaths every year.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.