Why is the seemingly simple science of masks so complicated?

Masks are back in the spotlight as Victoria has tightened its guidelines about what face coverings are allowed. Originally, people were allowed to use a face mask, scarf, bandana or face shield - but not anymore. Now only fitted face masks are allowed. Throughout the pandemic there has been mixed messaging on how important they are in the fight against COVID-19. Today, what you need to know about face shields and washing masks to help protect yourself and others. Also on today's research roundup episode: * A study on if a baby can catch coronavirus from breast milk * A study on the best way to point the nose swab used for COVID testing * Can SARS-CoV-2 develop resistance to the drug Remdesivir * The best way to communicate social-distancing and other public health messages * And what do we know about getting infected by SARS-CoV-2 from meat