Wow, I had no clue, but assumed Foundation sprung from BS. I like that Foundation is lighter and easier to override than BS, and even though it has a similar look, it's decidedly different than the stock, ubiquitous bootstrap design. But lack of IE8 support makes it a bit of a hard sell. I'm excited to see what's in store for both frameworks, but hope to see Foundation continue as a leaner, less opinionated alternative.