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Tarit Chakraborty

What matters is not the brain size, but the surface area of our brains, as theyonly are involved with our thinking capacity. Have you compared them?

Christian Cantrell

it's true that brain size isn't an absolute measure of intelligence -- especially when you compare across species. If that were the case, sperm whales would be far more intelligent than we are (and any other animal on the planet), and dolphins would be at least as intelligent as we are.

A better indication is relative brain size, or the ratio of the size of the brain to the size of the organism. That means from an evolutionary perpective, trends in brains size do seem to correlate to relative intelligence since scientists aren't just measuring absolute brain size as much as they measure the ratio of the size of the brain to the size of the human.

On an individual level, brain size is not a good indicator of intelligence, but on a large (and relative) scale, there does seem to be a tight correlation.

Brooks Bridges

I like your observation that "surviving rapid climate change bestowed upon humanity just enough intelligence to create even more rapid and dangerous climate change."

History shows we've done this on a smaller scale repeatedly - Rome, Sumer, etc., destroyed the local environment that fed them. Check out: "A Short History of Progress" by Ronald Wright. A great quote relating to your observation: "we are running twenty-first century software (our current culture) on hardware last upgraded 50,000 years or more".

It's maddening that history and current science both define the problem clearly but short sighted self interest prevents serious efforts to solve the problem. Our children and grandchildren will curse us.

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