This positive feedback cycle of credulity and confirmation is indeed fearsome, and responsible for much error, both in science and in everyday life. But it’s nothing compared to the death spiral that begins with a charge of positive affect—a thought that feels really good. A new political system that can save the world. A great leader, strong and noble and wise. An amazing tonic that can cure upset stomachs and cancer. Heck, why not go for all three? A great cause needs a great leader. A great leader should be able to brew up a magical tonic or two. The halo effect is that any perceived
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