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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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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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A seasonal flu vaccine is the best way to reduce the chances you will get seasonal influenza and spread it to others.
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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.