mass shooting May 16, 2022 6:39 pm How Do We Fight Back Against Racist Ideologies? Spread largely online, replacement theory is a concept pushed by white supremacists which claims whites are systematically being replaced by people of color. US & World Videos 1:48 Harvard protest temporarily shuts down Harvard Square in Cambridge 2:22 Needham neighborhood targeted in string of car break-ins, thefts 2:03 String of car break-ins, theft under investigation in Needham 1:53 Protest at Harvard over reported encampment punishments 0:20 Trash room fire sparks at Boston apartment building