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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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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).
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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.