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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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During pregnancy, a woman is more likely to experience bleeding gums and nosebleeds caused by hormonal changes that increase blood flow to the mouth and nose.
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Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.