There's naught so satisfying as a spot of unadulterated, self-congratulatory puffery, so let's get straight down to it and start celebrating our 50th (Dewey blog entry, that is). Other famous DDC-related fifties include ... Oh, hang on, there don't seem to be any. The word "fifty" doesn't occur even once in the whole of WebDewey. I was expecting at the very least to find that there'd been a Fifty Years' War at some point, but no. The closest you can get is the "Nineteen fifties," indexed in world history at 909.825, and in historical periods in Table 1--09045. Scrape around a bit and you'll also find the LC subject heading "Z39.50" mapped to 025.04 Information storage and retrieval systems. Lest we forget, though, there's always 050 itself, one of the great unsung outposts of the DDC, where vast troves of General serial publications (and indexes to same) await the intrepid text-plorer. A quick perusal of WorldCat confirms class 050 as the home of such venerable publications as Poole's index to periodical literature, The serials directory, and ... Mad magazine? Hmm, okay. Ordinarily you'll find general interest periodicals written in American English (Time, Newsweek, the New Yorker, etc.) at 051, those in non-American English at 052, those in other Germanic languages at 053, and so on. Reader: may your interests continue to be general, and may your favored DDC division be 050. Meanwhile, no prizes for guessing what our 100th post will be like.