@shawrd773 @mekkaokereke In 1980s Chicago, a substitute teacher exposed us to algebra in 4th grade. My parents noticed me perking up for two days, and I ended up taking algebra properly in 5th grade, calc in 8th. I might be unusual, but how would we know? I do know I didn't get all of the candy she used as a bribe, so some classmate was responding too -- but didn't have my parents to push them forward.