Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Individuals are never “cured” of addictions. Instead, they learn how to manage their disease to lead healthy, balanced lives.
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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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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.
An illustration of the structure of the Sun:
Structure of HIV.
Structure of tryptophan synthase
Structure and action of the T7 phage gene 4 helicase