Supposedly, when Louis Armstrong was asked "What is jazz?" he replied, "Man, if you gotta ask, you'll never know."
And if you "gotta" ask why I think this is the greatest invention ever, you'll never understand the answer.
I suppose a lot of you were already aware of it, but I wasn't. So there.
(UPDATE, since I seem to have confused some of you! It's a sponge for cleaning drinking glasses, with a "scrubby thing" on the tip. It gets the very bottom of the glass clean, which is hard to do!)
And okay, I'll admit that it isn't really "the greatest invention ever," but at least my title got your attention, dinnit?