Some of you may find this funny. I was reading a story description on slashdot, this:

"X is significantly expanding its open source codebase, which includes the app's 'For You' algorithm and its core ranking engine"

and on first glance, and I may not have gotten to the ranking engine part, I thought it was talking about X11. I was thinking "isn't x already 'open source', what am I missing here?