April 24, 2015 7:20 pm Slave Owners in the Family Tree Historian Peniel Joseph of Tufts University joins Mara Dolan to discuss Ben Affleck’s reasoning for asking PBS to remove information about an ancestor who owned slaves from “Finding Your Roots.” US & World Videos 3:05 100 protesters detained at Northeastern University 2:39 Community mourns police sergeant killed on duty 4:32 Anti-war protester at Northeastern speaks amid arrests: ‘We are peaceful students' 5:39 Billerica police sergeant hit and killed by excavator during construction detail 2:30 Arrests made in string of home break-ins targeting Asian-Americans