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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.
During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
The human body produces and destroys 15 million blood cells every second.
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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.