I saw an article that claimed January 26, 1974 was as close as we could come to pinpointing the 'birthday' of Dungeons and Dragons'. So, from an old grognard, Happy Birthday D&D!
Wow, 40 years! One time when I was visiting WoTC, I happened upon an actual copy of Chainmail in their library and it was in excellent condition. Flipping through that was crazy awesome.