The tendency to believe, after learning an outcome, that one would have foreseen or predicted it, also known as the 'I knew it all along' effect.
From 'hind' (back, behind) + 'sight' + 'bias.' Seeing clearly only after the fact.
Hindsight bias is your brain rewriting history — after something happens, you convince yourself you 'knew it all along.' But you didn't!
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