CAMBRIDGE, Massachusetts, March 15 -- The Massachusetts Institute of Technology posted the following news: * * * From Idaho to MIT, on a quest to cut methane emissions * Amid the hum of milking equipment and the shuffle of cow hooves, PhD student Audrey Parker and her collaborators pull a wagon through a dusty path of a dairy barn, measuring an invisible greenhouse gas drifting through the air. Most engineering students wouldn't expect their graduate research to take them to a dairy farm, bu  more