A Covid-19 vaccine study began this week with children. But what for, when the virus mainly affects older people? FYI presenter Tilly Lockey investigated with a panel of young people – Ruby from Kettering, Oliver and Trey from London, Nikita from Walsall and Farrah from Pontypridd, Wales. They put their questions to Dr Grace Li, part of the Oxford University AstraZeneca vaccine team. NOTE, this video was originally published in February 2020.