ScienceWeekly roundup: Supermarkets, masks and "viral loads"To play this audio please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoScienceConor Dillon | Gabriel Borrud04/07/2020April 7, 2020Why grocery stores are getting more dangerous every day, whether homemade facemasks actually help, the role of "viral load" and your immune system. Listen to DW's 30-minute science show. https://p.dw.com/p/3ab7aAdvertisement