An interesting book on this topic:
Summerhill: A Radical Approach to Child Rearing<p>Also:<p>A guy tought pre-school kids how to solve linear equations.
But he was an outsider so butthurt academics buried his research even though it was proven to be better:<p>Direct Learning, Sigfried Engelmann<p><a href="https://shallteach.wordpress.com/2020/05/18/di-an-introduction/" rel="nofollow">https://shallteach.wordpress.com/2020/05/18/di-an-introducti...</a>