Went downstairs to discover a flat just as I was ready to hit the road. It was nice to change it at home but, I failed to find the cause and patched the tube and rolled out. Of course, I felt the rr. wheel getting soft about 3/4's of the way to work. I didn't feel like changing it in the dark so, I just kept stopping and pumping-getting as much mileage on it a possible. I made it in about 20 minutes late, no biggie as I'm usually the first one in and pulled the tire off. It turns out I hadn't seen the tiniest sliver of glass embedded in the tread. I pulled it out, patched the tube and used Skabs to patch 3 cuts/holes in the tire. The cool thing is that I decided to give my Co2 pump a try. Wow, that was cool, got about 110 psi. in about 2 seconds-I couldn't believe how quiet and fast it filled my tire. I've gotten tired of riding home with the measly 30/35 pounds that my hand pump is capable of and, wanted to get accustomed to using the Co2. On the plus side, my legs have felt totally recovered from last weekend's century and were loose and strong. Hopefully this afternoon's ride will be uneventful.