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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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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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There are 60,000 miles of blood vessels in every adult human.

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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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