Flattery Will Get You Nowhere

544.8; 26.9. Another flat, coincidentally (?) right after pulling off to the side of the unpaved road, in the middle of a bunch of star thistles, to let a work truck go by. I examined the tires before I started to roll again! Less than a mile later, the back wheel is floppin'. Nice to have a spare tube and tools, and to be able to repair it on the spot, but I'm considering the "thorn-proof" tubes the guy showed me today. Otherwise, nice pleasant ride, not too hot or cool.