Massachusetts October 19, 2021 11:28 am COVID Q&A: Top Doctors Talk Vaccine Mix & Match, Efficacy and School Mask Mandates Top Boston doctors talk about the “mix and match” approach to COVID vaccine booster shots, variations in vaccine efficacy and school mask mandates. US & World Videos 3:50 Obesity expert discusses new proposal for U.S. dietary guidelines 4:41 Parents sue over AI chatbot they say encourages children to harm themselves and others 1:32 Patriots host annual children's holiday party 2:48 Hate grocery shopping? Robots could soon do it for you 2:08 Lawrence Fire Department's ‘Station 8' uses music to teach safety to kids
