Primality tests (Dubna, Summer 2015):
Lecture 1, Lecture 2, Lecture 3, Lecture 4.
(In the fourth lecture a team of videographers appears a little after the 43:00 mark and then sporadically through the rest of the lecture. They filmed me and the students on behalf of one of the sponsors of the summer school.)
Galois theory is a piece of cake.
(I had this made for a student's 21st birthday in my Galois theory class during 2015. Note how nicely the zeta is drawn, frankly better than some students wrote it on the homework.)
Kubota L-series, seen near the UConn math department in 2016. According to this website the letter L in "L-series" stands for loader or landscaper, so definitely not Langlands, and also they're compact.
An application of advanced math to cooking. Read the label carefully. (Taken from Crisco olive oil spray.)