December 7, 2015 8:40 am Understanding How Strokes Happen and How to Treat Them Dr. Marisela Marrero breaks down the cause and treatment of strokes. US & World Videos 1:57 Tensions escalate as protests across Mass. colleges continue 2:05 MIT students suspended amid pro-Palestinian protests 0:21 Man arrested in Centerville stabbing that sent victim to hospital 2:14 MIT suspends student protesters 3:13 Weather forecast: Clear and sunny, with temps in the 70s