Guest: May Warren, reporter for the Toronto Star With winter months bringing in an uptick in COVID-19 cases and a relatively static vaccination rate, Canada's top health officers are urging people to double down on masking because masks are the last line of defence against the virus. With a major shift (again!) in the conversation and culture around masking and new data available, reporter May Warren joins "This Matters" for a little bit of a refresher on masks, how we should wear them and why we're still talking about them. See Health Canada's latest guidelines and policies on masks here.