In the previous open thread, there was a request that we put together The Simple Math of Everything. There is now a wiki page, but it only has one section. Please contribute.
I added links to How Everything Works: Making Physics out of the Ordinary and the Khan Academy's Youtube video library with 800+ short video tutorials from basic arithmetic and math to college level phyics and finance.
Here's our place to discuss Less Wrong topics that have not appeared in recent posts. Have fun building smaller brains inside of your brains (or not, as you please).