Ah! Integral calculus! Surprisingly, calculus is not that hard at all, and most highschools now require it as part of high school (and even late middle school) course work.

What kids are learning today is leaps and bounds of what highschool used to teach even 10 yrs ago. Has anyone even seen what a 5th grader has to learn? Stuff that highschooler of 10yrs ago didnt even touch until they were juniors or seniors!