Science commentator Dr Siouxsie Wiles joins Susie to talk about the test to release scheme for Covid 19: some people are still testing positive at the end of their 7 days' isolation, which means they're still infectious. She'll also look at a study that identified five viruses that were able to kill a bacteria that inflamed the guts of mice - and the hope it may offer those suffering from inflammatory bowel disease. And even reading a brief story about women and girls engaging in maths was enough to change children's stereotypes about maths being only for boys. Associate Professor Dr Siouxsie Wiles is the head of Bioluminescent Superbugs Lab at the University of Auckland.