At the Olympics, furore over boxers Algerian Imane Khelif and Taiwan's Lin Yu-ting being able to compete has sparked debate about gender and the related issue of elevated levels of testosterone in sport. So, what does the science say about testosterone in women?

And health authorities in Victoria confirmed they had detected and disinfected the cooling tower linked to a deadly outbreak of legionnaires' disease in Melbourne. So, what exactly is legionnaires' disease - what symptoms does it cause?  

• Guest: Dr Norman Swan, host of What's That Rash? podcast and RN's The Health Report