There are two types of information: permanent and expiring. Permanent information is: “How do people behave when they encounter a risk they hadn’t fathomed?” Expiring information is: “How much profit did Microsoft earn in the second quarter of 2005?” Expiring knowledge catches more attention than it should, for two reasons. One, there’s a lot of it, eager to keep our short attention spans occupied. Two, we chase it down, anxious to squeeze insight out of it before it loses relevance. Permanent information is harder to notice because it’s buried in books rather than blasted in headlines. But
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