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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.
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Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.
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Cyanide works by making the human body unable to use oxygen.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.