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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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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.