Covid-19: how effective are face masks, really?
b'Since the start of the pandemic, face coverings and their ability to prevent the transmission of Covid-19 have been under constant scrutiny by scientists, politicians and the public. More than a year and a half in, what do \\u2013 and don\\u2019t \\u2013 we know? Madeleine Finlay speaks to Prof Cath Noakes about how effective different face coverings are, how best to use them, and when we should be masking-up. Help support our independent journalism at theguardian.com/sciencepod'