four ways of involuntarily inducing curiosity in humans: (1) the ‘posing of a question or presentation of a puzzle’; (2) ‘exposure to a sequence of events with an anticipated but unknown resolution’; (3) ‘the violation of expectations that triggers a search for an explanation’; (4) knowledge of ‘possession of information by someone else’.

The place of maximum curiosity – the zone in which storytellers play – is when people think they have some idea but aren’t quite sure. Brain scans reveal that curiosity begins as a little kick in the brain’s reward system: we crave to know the answer, or what happens next in the story,

answers, when they are too easily available, kill curiosity before it has a chance to take root.