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The human body produces and destroys 15 million blood cells every second.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Cucumber slices relieve headaches by tightening blood vessels, reducing blood flow to the area, and relieving pressure.
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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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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.