My nice ride to work was ended by a flat between the front door of the clinic where I shut off the alarm, and the basement door where I take my bike in. I wasn't even riding (don't want to ride across the lawn). That started a run of technical difficulties for the day: The 20W laser surgical unit could only produce 4W, which will hardly even cut, and the video camera for the otoscope quit working. I got to spend the day on the phone with service techs. Finally, I was able to change again and go back down to the basement to fix a flat. Too dark, had to bring the wheel upstairs. Remind me if I ever get to go on a long tour to take along a surgical light. They sure make it a lot easier to spot bits of glass. A biohazard sharps container is a good place to dispose of such bits, not likely to be flatted by that glass again. Great ride home, in shorts.