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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 human body produces and destroys 15 million blood cells every second.
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If you could remove all of your skin, it would weigh up to 5 pounds.
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In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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Calcitonin is a naturally occurring hormone. In women who are at least 5 years beyond menopause, it slows bone loss and increases spinal bone density.