Cyborgs go for gold

Michael McClellan flashes a thumbs-up sign as he speeds by on a recumbent tricycle, breathing hard but smiling behind dark sunglasses. He pedals along a paved path that loops through a leafy park in Cleveland, passing office workers enjoying alfresco lunches on a warm June day. They chew their sandwiches, oblivious to the guy on the trike. They have no idea that McClellan is paralyzed from the waist down, and that they're watching something extraordinary. It's a training session for one of the world's first competitive cyborg cyclists.