beginning of each of their essays on invisible forces. References 1. D. J. Boorstin, The Discoverers. (Random House., New York, 1983). Page | 16 W. James, The principles of psychology. (Holt, New York, 1890). R. Dawkins, Zhe God delusion. (Bantam, London, 2006). D. C. Dennett, Breaking the spell: Rel