[YeGoblynQueenne]

>> Not only does socialised human intelligence require at least a decade of formal education, but it also spends a lot of time in a complex 3D environment which is literally hands-on.

Note that for most of our history, the majority of humans did not get anything like "formal" education as we mean it today (i.e. going to school). Although adults in hunter-gatherer societies do teach children many things (e.g. which mushorooms are edible ect.) this must be done after a child has learned language -and those kids don't go to school to learn their language, they picke it up as they grow up.