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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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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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According to the Migraine Research Foundation, migraines are the third most prevalent illness in the world. Women are most affected (18%), followed by children of both sexes (10%), and men (6%).
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.