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DanArmak comments on Contrarianism and reference class forecasting - Less Wrong
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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.