Skepticism enjoins scientists — in fact all of us — to suspend belief until strong evidence is forthcoming, but this tentativeness is no match for the certainty of ideologues and seems to suggest to many the absurd idea that all opinions are equally valid. The chimera of the fiercely independent everyman reigns. What else explains the seemingly equal weight accorded to the statements of entertainers and biological researchers on childhood vaccines? Or to pronouncements of industry lobbyists and climate scientists? Or to economic prescriptions like 9-9-9 and those of Nobel-prize winning economists?