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And none of that is at all relevant to how lead affects the human brain and so is completely useless. You should have asked it "Would lead lower IQ in humans 20

And none of that is at all relevant to how lead affects the human brain and so is completely useless. You should have asked it "Would lead lower IQ in humans 2000 years ago the same way it does today?" This is what DeepSeekv3 says: Yes, lead exposure would have likely had similar detrimental effects on human cognition and IQ 2000 years ago as it does today. Lead is a neurotoxin that interferes with the development and function of the brain, particularly in children. Its harmful effects on intelligence, behavior, and overall health are well-documented in modern studies, and these effects would have been the same in the past, even if they were not understood at the time.

me-vs-cat 2y ago
No more useless than blind blanket assumptions, which was the point. > Yes, lead exposure would have likely had similar detrimental effects on human cognition and IQ 2000 years ago as it does today. ...these effects would have been the same in the past... I challenge you to consider that details matter, and one of those details is that the recent past through today has seen significantly more exposure to airborne lead than existed 2,000 years ago.