A new study on why flat earthers, birthers, climate change and Holocaust deniers stick to their beliefs in the face of overwhelming evidence to the contrary, suggests feedback, rather than hard evidence, boosts people’s sense of certainty when learning new things or trying to tell right from wrong.

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A new study on why flat earthers, birthers, climate change and Holocaust deniers stick to their beliefs in the face of overwhelming evidence to the contrary, suggests feedback, rather than hard evidence, boosts people’s sense of certainty when learning new things or trying to tell right from wrong.