It varies, but yes, relativity is often taught at the highschool level along with a brief intro to quantum mechanics (which is what that particular quote is referring to).Highschoolers are studying Einstein's theory now?
I mean, yeah, but the topic of relativity is only discussed until the surface level. However, in page 9, the Einstein tensor and Einstein field equation are shown in the background which require some knowledge of tensors and non-Euclidean geometry. I still struggle to have a basic understanding of tensors to this day. I don't know if I would've survived high school if these were the kinds of topics being taught.It varies, but yes, relativity is often taught at the highschool level along with a brief intro to quantum mechanics (which is what that particular quote is referring to).