Robert F Kennedy Jr, the nephew of the assassinated former president John F Kennedy, has filed to run for US president. Following the family footsteps into politics - that's not so unusual, you might think. As well as having an uncle in the top job, Mr Kennedy's father Robert F Kennedy - often known as Bobby - was assassinated in 1968 during his own run for the White House. But Mr Kennedy isn't exactly a chip off the old block, making a name for himself as an anti-vaxxer during the pandemic - and before. A history of anti-vaccine activism The...