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Medication errors are more common among seriously ill patients than with those with minor conditions.

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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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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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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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