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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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Green tea is able to stop the scent of garlic or onion from causing bad breath.
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Intradermal injections are somewhat difficult to correctly administer because the skin layers are so thin that it is easy to accidentally punch through to the deeper subcutaneous layer.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.