The history of science is peppered with “heretics.” Galileo is a classic example, as Maddox pointed out, apparently blind to the irony. The physicist David Bohm–who was sympathetic to Sheldrake's proposal–is another: the man Einstein called his “spiritual son,” and whose ideas so perturbed Robert Oppenheimer, the “father of the atomic bomb,” that he remarked “if we cannot disprove Bohm, then we must agree to ignore him”. A recent case is the astronomer Avi Loeb, a professor of science at Harvard, whose openness to entertaining evidence of extraterrestrial intelligent life has become a subject of bad‐tempered dispute. Some heretics turn out to be right, others do not. The jury is still out on Sheldrake, Bohm and Loeb.