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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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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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The National Institutes of Health have supported research into acupuncture. This has shown that acupuncture significantly reduced pain associated with osteoarthritis of the knee, when used as a complement to conventional therapies.
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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
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Women are two-thirds more likely than men to develop irritable bowel syndrome. This may be attributable to hormonal changes related to their menstrual cycles.