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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.
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There are 20 feet of blood vessels in each square inch of human skin.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Chronic marijuana use can damage the white blood cells and reduce the immune system's ability to respond to disease by as much as 40%. Without a strong immune system, the body is vulnerable to all kinds of degenerative and infectious diseases.