Disaster science, in which lots of little, seemingly inconsequential things add up to large problems. For instance, at the Oscars, “having senior executives taking such a front-line role can be a recipe for trouble – they’re more likely to assume they’re going to do it right. Many accidents have been triggered by very experienced workers who grew overconfident and complacent — wilderness firefighters, for example, are most likely to be killed or injured in their 10th year on the job.”