Everything (mathematics) is illuminated in this excellent thirteen-part series created by Annenberg Media for adult learners and high school teachers. As their website notes, the series "explores major themes in the field of mathematics, from humankind's earliest study of prime numbers, to the cutting-edge mathematics used to reveal the shape of the universe." First-time visitors can read a brief introduction to the series, and then look over some of the thirteen units, which include "Game Theory", "Other Dimensions", and "Geometries Beyond Euclid". Each unit includes a relevant video segment (free registration required), a video transcript, and a different interactive feature designed to complement the material within. Also, visitors can take advantage of a glossary and a "Math Family Tree", which highlights major mathematical discoveries from the year 25000 BCE to present-day Fields Medal winner, Grigori Perelman.