Just a few more days before I think that I will need to slap on the studded tires for the season, and I find this morning that my back tire was flat. It appeared that all the coming-and-going of yesterday, all piled down with weight, pinched the inner tube, puncturing it.
So... I pushed the bike to the bus stop and pushed it to the ELI. Then, in the evening, I took the #8 bus to Great Lakes to get a new tube.