April’s Site of the Month is: TEDEd Lessons Worth Sharing
TEDEd Lessons are short (~4mins) video clips, and the ones on mathematics include several riddles, plus unusual uses of mathematics. There are also some conventional clips such as “The Secrets of Pascals Triangle” (which does acknowledge prior appearances in other cultures) and “The Complex Geometry of Islamic Design”. If you have an idea for a mathematical TEDEd Lesson then you can get assistance making the animated video.