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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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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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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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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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On average, the stomach produces 2 L of hydrochloric acid per day.