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There are 60,000 miles of blood vessels in every adult human.
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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.
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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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Many of the drugs used by neuroscientists are derived from toxic plants and venomous animals (such as snakes, spiders, snails, and puffer fish).
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.
![Blood-typing and cross-reactions: The blood type depends on the presence of surface antigens (agglut](https://biology-forums.com/gallery/47/medium_14755_01_10_12_7_59_21_9228594.jpeg)
![A woman in a net on a Congo shore. Although the importation of slaves was illegal after 1807, histor](https://biology-forums.com/gallery/47/medium_375552_19_08_15_9_09_52_223212491.jpeg)