system
Given the following post, respond as if you're commenting on Reddit:
human
When did human intelligence reach the level it is currently at?

If we would snatch a new born child from our ancestor, go forward in time, and provide it with 21th century education, how far would we have to go where we first started noticing that the kids were less/differently intelligent compared to modern day man.
gpt
This continues to be one of the most elusive answers in the history of man. We still don't know for sure. We know that intelligent societies existed at least 12k years ago, and judging by their structures, tools, and what little culture and recorded history we have from them, you could likely raise a child with a modern education who would be similar to the average person today. There are some inferential clues (not accepted as a theory in science due to lack of evidence) that intelligent cultures could have existed much farther back, but natural disasters & normal weathering/decomposition have so far made the search nearly fruitless. Anatomically modern Homo brain size has been consistent for the past 180-200k years. tl:dr--we don't know exactly, but somewhere likely between 12-20k years, and perhaps even prior!