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Chris Hu said:
shavenferret said:

Well, ok, but that ignores the vast and ever increasing amounts of chemicals in the environment from industrial sources, microplastics, lack of physical exercise, and more processed foods that come from some factory.  It's not nearly so simple as what you're trying to say, or even what i'm saying because there are probably multiple reasons.  

Sure, that is the case, but leaded gasoline is still the main culprit in the decline of global overall IQ in the last 100 years, and we still have not recovered from all the damage that was caused by leaded gasoline.  

Which decline? IQ has gone up in the last 100 years (in all areas), not down:

Maybe the gains would be a bit higher without the toxic effect of leaded petrol (in big cities with too much cars), but there wasn't a decline.

https://en.wikipedia.org/wiki/Flynn_effect