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no idea if this is true, but one of the most formative things I read was an interstitial essay by @JohnBarnesSF in one of his short story collections (Apocalypses and Apostrophes ?) talking about Kondratiev waves or something like them - the idea that every ~100 years https://twitter.com/memcculloch/status/1306167466503139328 …
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3/ It would be quite something if we're starting a 30 year stretch where - reusable rockets developed (known possible) - AI-like software developed (known possible) - panspermia proven (known possible) - physics overhauled / inertial drives developed (known impossible)
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