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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
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To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.