New technologies and social changes have consistently happened at a rate that would seem absurd and impossible to people only a few decades before they happen. Hindsight bias causes us to see the past as obvious and as a series of changes towards the "normalcy" of the present; availability biases make it hard for us to imagine changes greater than those we've already encountered, or the effects of multiple changes. The future will be stranger than we think.
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This post is part of the Rerunning the Sequences series, where we'll be going through Eliezer Yudkowsky's old posts in order so that people who are interested can (re-)read and discuss them. The previous post was Availability, and you can use the sequence_reruns tag or rss feed to follow the rest of the series.
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