(In the 1980s, physicists were very excited about various particles which were postulated to exist. Supposedly these would prove a series of contentions regarding sub-nuclear physics and the fundamental laws of the universe. Physicists got the money to look for them, but found nothing. The energy range where they were supposed to have been was then dubbed 'the Great Desert'. That didn't stop the theory being taught to me as if fact when I was an undergraduate - before anyone had had the chance to look. At the time I felt this was more akin to religious fervour than hard science.)