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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.