As I'm sure most of us barefooters do, when the roads are hot, I seek out the handy white lines which are always cooler than the hot asphalt. I have noticed lately that a lot of the newer white lines on the roads are rougher than the older lines. I found out yesterday that the new lines are rougher because the paint is mixed with glass beads to make them shinier at night. So, I guess a good part of my runs on hot days is on glass. Interesting.