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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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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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Of the estimated 2 million heroin users in the United States, 600,000–800,000 are considered hardcore addicts. Heroin addiction is considered to be one of the hardest addictions to recover from.
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The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
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The average office desk has 400 times more bacteria on it than a toilet.