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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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Interferon was scarce and expensive until 1980, when the interferon gene was inserted into bacteria using recombinant DNA technology, allowing for mass cultivation and purification from bacterial cultures.
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There are more bacteria in your mouth than there are people in the world.
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There are 60,000 miles of blood vessels in every adult human.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.