“Expiring knowledge catches more attention than it should for two reasons: one, there's a lot 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 it's benefit is huge. It's not just hat permanent information never expires, letting you accumulate it, it also compounds over it, leveraging off what you've already learned. Expiring information tells you what happened. Permanent information tells you WHY something happened and is likely to happen again. That WHY can translate into stuff you know about other topics, which is where the compounding comes in. I read newspapers and books everyday. I cannot recall one damn thing I read in a newspaper from say 2011, but I can tell you in great detail about books I read in 2011 and how they changed the way I think.”