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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
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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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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.