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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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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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There are 20 feet of blood vessels in each square inch of human skin.
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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.