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Vaccines prevent between 2.5 and 4 million deaths every year.
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Green tea is able to stop the scent of garlic or onion from causing bad breath.
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When blood is deoxygenated and flowing back to the heart through the veins, it is dark reddish-blue in color. Blood in the arteries that is oxygenated and flowing out to the body is bright red. Whereas arterial blood comes out in spurts, venous blood flows.
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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.