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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.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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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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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.