Everyone is familiar with the "cold winters" hypothesis of intelligence and it's almost certainly true to some extent (neanderthals did have larger brains ~1410 cm^3) - that's definitive proof of selective pressure 7/x
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Touching on one point from earlier though. The nodes that are connected via an edge from the second continent are subject to the same broad forces as the Eurasian continent but the process starts many 1000s of years later. Re-introduction has entirely predictable results. 18/x
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Counterfactual speculation - if the graph doesn't have more nodes away from the Eurasian node does the cancer spread? You could make a case that it doesn't - that the evolutionary arms race forces are too strong, constantly pushing to a new local maximum. 19/x
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So maybe the filter is: Life, etc. Need isolated continents Can't have isolated continents that branch off only edge of the origin continent Who knows what the probability of development like that is? Time to start studying exoplanet-plate tectonics 20/x
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