July 11, 2016 8:40 am Testosterone and the Brain Researchers are looking closely at a new study that may show a connection between testosterone levels and brain function. Dr. Marisela Marrero has more on the findings in the video. US & World Videos 2:08 Tension grows over campus protests in Boston 2:31 Fallen Billerica Police Sgt. Ian Taylor honored at vigil 2:33 Massive fire destroys Randolph apartment building 2:50 Rally held in Boston in support of Jewish college students 2:39 MIT president calls for shutdown of student encampments
