Diaries can be particularly helpful tools for accurately capturing positive events. In his book, Thinking, Fast and Slow, the psychologist Daniel Kahneman distinguishes between experience and memory, noting that human memory of an experience can easily be altered. Kahneman describes a man who was enjoying a concert immensely until the very end, when there was an obnoxious sound in the concert hall. The man said that the noise ruined the entire concert for him. But it didn’t really, of course; he had enjoyed the concert up until that moment. What it did ruin was his memory of the concert. By
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