The rapid development and roll-out of coronavirus vaccines has been a reminder of the power of science and technology to change the world. Host Tom Standage considers some of the technologies to watch in 2022, from 3D-printed housing and heat pumps to flying electric taxis and meetings in the metaverse.  Please subscribe to The Economist for full access to print, digital and audio editions: www.economist.com/podcastoffer   See acast.com/privacy for privacy and opt-out information.