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There are more bacteria in your mouth than there are people in the world.
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Multiple sclerosis is a condition wherein the body's nervous system is weakened by an autoimmune reaction that attacks the myelin sheaths of neurons.
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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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Thyroid conditions may make getting pregnant impossible.
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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.