--- Log opened Sun Apr 21 00:00:50 2019
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04:34 < adlai> kanzure: interesting, I wasn't aware that had an accepted name... spent a coffee/cigarette/vapor break discussing that, the other week
04:35 < adlai> as often happens when undergrads rediscover ancient debates, it went roughly thus:
04:35 < adlai> q: "how can we know that we're not the N+1th civilization, the previous ones have been destroyed like the dinosaurs?"
04:36 < adlai> me: "speculator, meet burden of proof; burden of proof, meet another speculator"
04:38 < adlai> fenn: the pernicious version of this hypothesis says that the early civilizations were so advanced that they reduced,reused,&recycled everything, and the only traces of them that may remain are, e.g., inconsistencies between isotope distributions in the crust, and those one would expect from supernovae alone
04:43 < TMA> fenn: also modern concrete tends to break down and be reduced to gravel, sand and silt on the time frame of 70 years; ancient (roman) concrete seems to be more durable, but then its composition is rather 'natural' hence overlooked
04:46 < TMA> the macrostructure is more durable (a trench, even when filled, can be easily seen after thousands of years)
04:48 < adlai> the truly problematic areas are ones where the major chemical thermodynamics are inverted relative to today
04:48 < TMA> but then, even those are rather small (on the geological scale) so might be easily overlooked
04:55 < adlai> actually I guess these might not make a major difference, once there's a sufficient variety of oligokaryotes to keep churning the small molecules
04:56 < adlai> on a galactic scale, the littery part of life is quite short... blink twice, and all that's left is a curious quasar
05:01 < adlai> TMA: i'm still wondering whether your nick is justa buncha letters, or an abbreviation (trimethylamphetamine? tetra-? too much academia?)
05:04 < adlai> in other creative misunderstanding, is "The Beatles 1" just a message from time-travelling cockroaches that survive the nuclear lollercauster?
05:04 < adlai> as in, "hominids lost, the beatles won"
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05:22 < TMA> adlai: it is in fact a bit convoluted acronym of my name
05:28 < TMA> adlai: George Washington would be abbreviated to WGA by the same algorithm that yielded TMA
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09:53 < Urchin> TMA: what's really interesting are the 2000-ish yo concrete shelves in catacombs
09:53 < Urchin> and how to make it has *finally* been rediscovered
09:54 < Urchin> turns out nobody bothered to write down that you need to use sea water
09:54 < Urchin> otherwise how to make it has been written down
10:01 < TMA> Urchin: (a) it might have been written down. the amount of written text that has been preserved is rather thin (and most of that is religious) (b) it might be a deliberate omission -- way to keep the trade secret
10:02 < Urchin> TMA: it's more likely that it was simply something so basic that nobody thought it important to write it down
10:03 < TMA> or maybe that.
10:04 < Urchin> anyway, seasteaders are pretty interested in roman concrete
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13:37 < kanzure> .title https://news.ycombinator.com/item?id=19712465
13:37 < yoleaux> Ask HN: What does your ML pipeline look like? | Hacker News
13:44 < kanzure> http://www.unz.com/gnxp/human-is-as-human-does/
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17:46 < Jenda`> adlai: (also, "tma" means "darkness" in Czech)
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--- Log closed Mon Apr 22 00:00:51 2019