Primality tests (Dubna, Summer 2015): Lecture
1, 2, 3, 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. You can find out more about the Kubota Standard L-series here. According to this page these L-series are compact (who knew?). I think the letter L in "L-series" stands for loader or landscaper, definitely not Langlands.
An appliction of mathematical logic to street signs. If that Google street view link dies, a screenshot is here (look in the lower right).
An application of advanced math to cooking. Read the label carefully. (Taken from Crisco olive oil spray.)