I did not get to do much biking tonight, I did not see the broken glass on the path, well I hit it and my back tire went out, so I walked back to get my car put the bike on the bike rack and went down to the bike shop to get a new tube. But would you not know it, the shop was closed, normaly it is open till 7pm but on fridays it turns out it closes at 5pm. So I am going to have to go down tomorrow to get the new tube. I should buy a spare just in case this happens again. The current tube is so bad it will not hold air anymore.