He claims that "the laws of nature are written in the language of calculus". If he means the actual laws, IMO, that is likely to be wrong - they are more likely to be discrete maths.
The laws of nature that physicists actually use, however, are written in the language of Calculus. And understanding the laws in Calculus form is ridiculously useful.
Hell, everyone shouldn't just have to take Calculus, they should have to take Differential Equations as well. You cannot understand reality without calculus knowledge, or without an understanding of differential equations.
This guy says that the problem is that high-school math education is structured to prepare people to learn calculus in their freshman year of college. But only a small minority of students ever takes calculus, and an even smaller minority ever uses it. And not many people ever make much use of pre-calc subjects like algebra, trig, or analytic geometry.
Instead, high-school math should be structured to prepare people to learn statistics. Probability and basic statistics, he argues, are not only more generally useful than calculus, they are also more fun.
I have to agree with him. What do the people here think?