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There are more nerve cells in one human brain than there are stars in the Milky Way.

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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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People about to have surgery must tell their health care providers about all supplements they take.

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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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According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

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