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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.
Once thought to have neurofibromatosis, Joseph Merrick (also known as "the elephant man") is now, in retrospect, thought by clinical experts to have had Proteus syndrome. This endocrine disease causes continued and abnormal growth of the bones, muscles, skin, and so on and can become completely debilitating with severe deformities occurring anywhere on the body.
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.
When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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.