Multiple conspiracy theories are circulating about Covid-19 - but how widely are they believed and what influence do they have? From QAnon to the death of Jeffrey Epstein, conspiratorial thinking seems to be everywhere right now - is this the era when fringe ideas have gone mainstream? Katty Kay and Carlos Watson speak to political scientist and conspiracy theory expert Prof Joseph Uscinski to explore why people believe in them, and what the potential consequences for wider society might be. They hear directly from those who believe in them, as well as people who have been subjected to personal attacks from conspiracy theory extremists.