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Did you know?
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.
Did you know?
Your skin wrinkles if you stay in the bathtub a long time because the outermost layer of skin (which consists of dead keratin) swells when it absorbs water. It is tightly attached to the skin below it, so it compensates for the increased area by wrinkling. This happens to the hands and feet because they have the thickest layer of dead keratin cells.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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Thyroid conditions may make getting pregnant impossible.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.