Bad knees may be more of a guy thing

Related: Men's health

1. Men's health
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   3. Testosterone doesn't boost functioning in older men
   4. Sauna visits may lower sperm count
   5. Guys get this disease, too -- but they may not know it
2. Top health stories
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   2. Biggest killer in Superstorm Sandy: drowning, study finds
   3. Bring back PE: Exercise should be 'core' class
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