This fall, Hoopes and his students have watched two predicted cataclysmic dates — Oct. 21 and 28 — come and go with little fanfare. Oct. 21 was a date selected by California evangelist Harold Camping after his original May 21, 2011, prediction passed without calamity. Swedish pharmacologist, self-help advocate and self-taught Maya cosmologist Carl Johan Calleman was among those predicting that Oct. 28 would usher in a worldwide unified consciousness.