The next time someone tries to argue that all M&Ms; are the same, no matter the color, you can tell them about the blue M&M.; The candy (like Gatorade and other products) gets its color from a food dye similar to Brilliant Blue G (BBG) -- a compound that, as it turns out, is medically useful. Building on earlier research, scientists at the University of Rochester Medical Center have found that injections of BBG can relieve mice of secondary spinal cord injuries. In September, they will start conducting human clinical trials.