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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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Blood is approximately twice as thick as water because of the cells and other components found in it.
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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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There are 20 feet of blood vessels in each square inch of human skin.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.