

This very much depends on the subject, I suspect. For math or computer science, wikipedia is an excellent source, and the credentials of the editors maintaining those areas are formidable (to say the least). Their explanations of the underlaying mechanisms are in my experience a little variable in quality, but I haven’t found one that’s even close to outright wrong.
People post this kind of stuff in the reviews for every kinky item on Amazon, I’ve never understood the compulsion to share your fic in that medium but I guess some folks gotta write when the inspiration hits 'em…