This mod simply expands the Civilopedia screens for Improvements, Terrain, and Features so that there is a section for History. Previously these screens show you the characteristics and what it does in game, but you can't tell any background story about it. With these three python files, you can. The XML tag for these civilopedia entries is already present in civ, it simply isn't placed in the screen by python, but this puts it there. A huge mod at a whopping 7.8 kb.
http://forums.civfanatics.com/downloads.php?do=file&id=13720
http://forums.civfanatics.com/downloads.php?do=file&id=13720