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Patients who have undergone chemotherapy for the treatment of cancer often complain of a lack of mental focus; memory loss; and a general diminution in abilities such as multitasking, attention span, and general mental agility.
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The average office desk has 400 times more bacteria on it than a toilet.
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There are 20 feet of blood vessels in each square inch of human skin.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.