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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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.
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HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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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.