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British researchers say the muscular exertion involved in laughing triggers an increase of endorphins in the brain, making it enjoyable. Jeff Glor reports

The Muscular Dystrophy Association announced that legendary 85 year old entertainer Jerry Lewis will no longer serve as their national chairman and he won't be back as the host of their telecasts, which he initially brought into the spotlight. CBSNews.com's Ken Lombardi reports.