It seems like there have been a few posts recently about edX courses here on Brilliant, so I decided to browse through the course offerings. One called "Street-Fighting Math" caught my eye. It's a problem solving course that teaches to "shoot first and ask questions later". Also, the topics looked really cool, like "singing musical intervals to estimate logarithms".
The link is here. Looks like a pretty interesting, what do you guys think? I'm definitely gonna check it out.