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There are 20 feet of blood vessels in each square inch of human skin.
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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.
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.