This week - we're pondering periods. With about 800 million people menstruating each day around the globe, we're re-visiting the biology, musing over menstruation and mental wellbeing, and asking why, in 2020, period poverty is such a problem. Plus in the news - Lockdown, or let rip? Are our efforts to try to stop the spread of coronavirus taking us in the wrong direction? An update on England and Wales' NHS Covid app. And with England's ban on some single use plastics now in force, why do we have so much of it in the first place? Like this podcast? Please help us by supporting the Naked Scientists