The availability heuristic
We tend to judge the likelihood and significance of things based on how easily they come to mind. The more “available” a piece of information is to us, the more important it seems.
The result is that we give greater weight to information we learned recently because a news article you read last night comes to mind easier than a science class you took years ago. We also give greater weight to information that is shocking or unusual. Shark attacks and plane crashes strike us more than accidental drowning or car accidents, so we overestimate their odds.
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