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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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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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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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The average adult has about 21 square feet of skin.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.