One of my long-standing love affairs in math is with Riemann’s Zeta Function. I use it as an illustration of a few points in my high school classes. Since I name-dropped it in my recent series on Cur Deus Homo, I figured I’d cover a bit more about it. Here’s a fantastic video explanation to a very difficult and fun bit of math.
You should give this guy a follow; he does fantastic work.
Math on!
Teaching Boys Badly 