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Uncle Sam has a message for sluggish Americans: Get moving now. More than 15% of American adults are physically inactive, a new U.S. Centers for Disease Control and Prevention study reports. And all that time on the couch or staring into a computer screen adds to the risk of health problems and premature death. "Too many adults are inactive, and they may not know how much it affects their health," said Dr. Ruth Petersen, director of the

Mosquitoes that can't be infected by or spread dengue virus have been created by scientists. The researchers genetically engineered the mosquitoes to be resistant to all four types of dengue, a mosquito-borne virus that's a significant global health threat. This is the first time that mosquitoes have been genetically engineered to be resistant to all types of dengue, which could significantly improve control of the disease, the scientists added. The team reported that it may be possible to