PhilGoetz comments on Intelligence as a bad - Less Wrong
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On one hand, evolution appears to work in a punctuated manner, meaning that individual components of evolutionary systems are usually at equilibrium.
On the other hand, brain volume in our ancestors rose smoothly from 3 million years ago to the present.
On the other other hand, some Neanderthals had larger brains than modern humans.
You can't simply assert that. It's an empirical question. How have you tried to measure the downsides?
It seems so obvious to me that I didn't bother... Here's some empirical data: http://www.ted.com/talks/hans_rosling_shows_the_best_stats_you_ve_ever_seen.html . Anyways, if you really want to dispute the fact that we have progressed over the past few centuries, I believe the burden of proof rests on you.