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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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On average, the stomach produces 2 L of hydrochloric acid per day.
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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.