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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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On average, the stomach produces 2 L of hydrochloric acid per day.
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There are 20 feet of blood vessels in each square inch of human skin.
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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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Astigmatism is the most common vision problem. It may accompany nearsightedness or farsightedness. It is usually caused by an irregularly shaped cornea, but sometimes it is the result of an irregularly shaped lens. Either type can be corrected by eyeglasses, contact lenses, or refractive surgery.
![In 2008, the U.S. economy suffered a gaping wound as several trillion dollars were ripped out of it.](https://biology-forums.com/gallery/47/medium_262797_12_08_15_1_33_47_22176335.png)
![French and U.S. presidential elections in 2012 illustrate the durability of political culture and ho](https://biology-forums.com/gallery/47/medium_262797_12_08_15_1_46_34_22188815.png)