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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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Asthma cases in Americans are about 75% higher today than they were in 1980.
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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.
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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.