As governments consider loosening lockdowns, troubling evidence suggests that the virus behind covid-19 lingers in the air, making it more communicable than previously thought. Lidia Morawska, of the International Laboratory for Air Quality and Health in Queensland, argues for better indoor ventilation. Also, Dr Vivian Lee from Verily, on how she would fix the American healthcare system. And, the “illuminating” technology revealing archaeological secrets. Kenneth Cukier hosts 

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