This week in the spirit of the International Year of Plant Heatlh, Stu tells us about the arms race between brassicas – which include vegetables such as cabbages, kale, cauliflower and broccoli – and their pests and diseases; meanwhile Claire shares what it's like to get tested for COVID-19, and how recent research shows that "superspreaders" could be responsible for clusters of coronavirus outbreaks. Remember, if you're concerned you can get information at health.gov.au, which also has a list of testing locations.