Such scientific caution runs against the grain of human nature. As the post-Oslo speculation reveals, our natural inclination is to grab on to the first plausible explanation and happily gather supportive evidence without checking its reliability. That is what psychologists call confirmation bias. We rarely seek out evidence that undercuts our first explanation, and when that evidence is shoved under our noses we become motivated skeptics—finding reasons, however tenuous, to belittle it or throw it out entirely.
