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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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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Everyone has one nostril that is larger than the other.
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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.