Coronavirus: Do face masks actually work?
After Prime Minister Benjamin Netanyahu instructs all Israelis to wear face masks in public, we ask, when are masks useful and when are they not? Also on the programme: Could cruise ships have done more to reduce on-board coronavirus infections? And, historian Yuval Noah Harari says we have stark choices to make about our post-pandemic future. (Picture: A woman wearing a face mask is reflected in a window as she leaves a shop in Tokyo, Japan. Credit: Carl Court/Getty Images)