Intelligent design
Intelligent design has not presented a credible scientific case, substituting public support for scientific research. If the argument to give "equal time for all theories" were actually practiced, there would be no logical limit to the number of mutually incompatible supernatural "theories" regarding the origins and diversity of life to be taught in the public school system, including intelligent design parodies such as the Flying Spaghetti Monster "theory"; intelligent design does not provide a mechanism for discriminating among them. Philosopher of biology Elliott Sober, for example, states that intelligent design is not falsifiable because "[d]efenders of ID always have a way out". Intelligent design proponent Michael Behe concedes "You can't prove intelligent design by experiment".