if you're talking cognitive ability i believe there is some evidence of a slight decline, but not something that would be really noticeable, over the last 10,000 or so years, but i could be wrong. i heard about it on the radio.
if you're talking about how delusional we are then i would say we started to peer through the veil for a bit in the last couple centuries and then the people in charge realized how useful our delusions really are.
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