The first covid-19 vaccines came from rapid innovation. They have already saved millions of lives. What new technologies are in the pipeline?   Robin Shattock’s team at Imperial College London is developing a self-amplifying RNA vaccine.   Moz Siddiqui of Gavi, the Vaccine Alliance, describes a drone system delivering shots to remote areas.   And Pamela Bjorkman of the California Institute of Technology explains her research into a universal coronavirus vaccine that could protect against future pandemics. Alok Jha and Natasha Loder are joined by Oliver Morton, The Economist’s briefings editor. For full access to The Economist’s print, digital and audio editions subscribe at economist.com/thejabpod. Sign up for our new weekly science and data newsletters at economist.com/morescience and economist.com/offthecharts   See acast.com/privacy for privacy and opt-out information.