Michael Rosen and Dr. Laura Wright are joined in the studio by a virtual assistant and Tom Hewitson - conversation designer for the likes of Siri, Alexa and Cortana. They discuss whether virtual assistants can ever speak like actual humans, and how us humans are developing a new vernacular for machines. Mitsuku is a bot that won an award for most human-like AI and Tay is a now-deceased bot who learnt to speak like a Nazi. Producers Eliza Lomas & Sally Heaven.