Hello. Back in September 2012, there must have been a steam sale for CIV 4 and its expansions, because I bought it. I was playing CIV 5 at the time, and i never got around to starting up 4. Now I am thinking it is time to take the plunge. I skimmed the FAQ and started to look at the quick newbie questions thread, until I realized there might be 20,000 posts, which seem to be very definition of an appropriate time for the TLDR acronym. What I would really like to find is a list of major changes from 5 to 4 (I have about 860 hours logged into 5). It seems relatively overwhelming to be start from scratch again. Any suggestions?