Last week I found wolfram alpha by random chance and it blew my mind, a couple days later I ran across this channel on youtube, and I can't stop watching their videos. I'm officially saying it's the greatest youtube channel ever. You will love it, trust me. http://www.youtube.com/user/sixtysymbols Snipped from the channel description: This is Sixty Symbols - a channel devoted to those funny letters and squiggles used by physicists and astronomers. We're posting videos about what they mean and how they're used - plus other interesting stuff about physics and astronomy. Edit Note: http://www.youtube.com/user/tedtalksdirector Another great youtube channel, but I think everyone already knows about this one.