It's a question that many of us have probably thought of while we're out for a walk on a beautiful summer evening in Milwaukee. You bend down to tie your shoe, and there, next to your foot, is a date, stamped into the sidewalk like in the picture above. Well, maybe you haven't wondered what the date is doing there, but it's a question that occurred to listener Stephen Howe, anyway, and he got in touch with our Bubbler Talk team to figure out the answer. So why are dates stamped on Milwaukee