For math students and teachers, along with anyone looking to learn a bit more on the subject, PBS's Infinite Series will appeal. In this series of short videos (10-15 minutes apiece), mathematician Kelsey Houston-Edwards provides engaging explanations of upper-level mathematics concepts. In the most recent video (as of this write up), Houston-Edwards explains graph coloring and how the math concept relates to the popular puzzle, Sudoku. In another video, viewers learn about Pick's theorem and how it can be used to calculate the area of complex polygons. Each video is accompanied by additional resources, such as books and websites, for those who want to learn more. These videos are likely to appeal to viewers with a range of mathematical backgrounds: Houston-Edwards dedicates each video to complex, advanced mathematical concepts, but is also quite skilled at breaking down these concepts with accessible diagrams and simple vocabulary.