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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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People about to have surgery must tell their health care providers about all supplements they take.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Cyanide works by making the human body unable to use oxygen.
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The modern decimal position system was the invention of the Hindus (around 800 AD), involving the placing of numerals to indicate their value (units, tens, hundreds, and so on).