I really like MIT's Open Courseware offerings (available on youtube). From HN, @optbuild shared some math-stuff, e.g., - Fourier Transform (https://news.ycomb

I really like MIT's Open Courseware offerings (available on youtube). From HN, @optbuild shared some math-stuff, e.g., - Fourier Transform (https://news.ycombinator.com/item?id=35858725 https://news.ycombinator.com/item?id=35858725) - Mathematical Problem Solving (https://news.ycombinator.com/item?id=35858763 https://news.ycombinator.com/item?id=35858763) So did @__rito__ (https://news.ycombinator.com/submitted?id=__rito__ https://news.ycombinator.com/submitted?id=__rito__). I am also a fan of Complexity Explorer (which @__rito__ shared). Can't say enough great things about Santa Fe Institute.