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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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About 3.2 billion people, nearly half the world population, are at risk for malaria. In 2015, there are about 214 million malaria cases and an estimated 438,000 malaria deaths.
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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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Approximately one in four people diagnosed with diabetes will develop foot problems. Of these, about one-third will require lower extremity amputation.
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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.