Hackers light the windows of the Green Building to display "179," the badge number of MIT Police Officer Sean Collier, who was killed three years ago during the Boston Marathon bombings. Tristan Honscheid–The Tech May. 9, 2016 Facebook Twitter Reddit Print Hackers light the windows of the Green Building to display "179," the badge number of MIT Police Officer Sean Collier, who was killed three years ago during the Boston Marathon bombings. Tristan Honscheid–The Tech