2020: QR codes finally became useful

Why have the little black and white grids you have to photograph to go to a café become the go-to tech for the pandemic? Can artificial intelligence tell if you have Covid from the sound of your cough? And Marc's given up on hovercars, but maybe we can still get holograms in our future…Guests: Jessie Hughes, VR expert and creative technologist + Peter Wells, tech writer and host of Meta, a podcast about podcasts @peterwells