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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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There are more nerve cells in one human brain than there are stars in the Milky Way.