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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Illicit drug use costs the United States approximately $181 billion every year.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Today, nearly 8 out of 10 pregnant women living with HIV (about 1.1 million), receive antiretrovirals.
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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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