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Did you know?
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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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
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The shortest mature adult human of whom there is independent evidence was Gul Mohammed in India. In 1990, he was measured in New Delhi and stood 22.5 inches tall.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.