Traveling the 3500 miles in June, we never once thought to check the Garmin to see if it could locate rest stops. We were always looking. The Interstate Highways provided full service stops at regular intervals until we got into Arizona. According to the locals, the state is out of money. Most of the rest stops are barricaded. Fortunately the main gate facilities at Grand Canyon National Park (south rim) had restrooms with all the right stuff: running water, sinks, and toilet bowls. And, on the backs of the stall doors you could read the details of how the water got there (from the north rim) and an intricate drawing to explain how it is recycled back to your next flush. (A few of the particulars confused me, but ..oh~ never mind.) Farther into the park, where no water is available, there are outdoor chemical latrines with huge black vent pipes. I don’t know the physics involved, but I can tell you this: when...