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timtyler comments on Contrarianism and reference class forecasting - Less Wrong
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But that's just what I'm asking about! Can you please give me some references that present or at least mention this theory? Because the WP articles don't even seem to mention it, and I can't find anything like it on Google.
The theory is that they had bigger brains - e.g. see the reference at:
http://lesswrong.com/lw/165/how_inevitable_was_modern_human_civilization_data/124q
Yes, but they also had more massive bodies, possibly 30% more massive than modern humans. I'm not sure that they had a higher brain/body mass ratio than we do and even if they had, a difference on the order of 10% isn't strong evidence when comparing intelligence between species.