When I first started my business about 10 years ago, I drove a truck around that didn't have air conditioning. I'm not looking for sympathy, we had just moved from Seattle and there isn't much of a need for AC up there. The last couple of summers the Western Colorado desert has been HOT!! Thank goodness I now have AC.
One way I try to stay cool is carrying a 3/4 frozen (the other 1/4 is water) 1/2 gallon water bottle with me when I leave the house. I usually drink it all by the end of the day and sometimes have to stop and pick up another quart. When I stop at my customer's home or office, I place my water bottle on the floor in a place where I think it will stay shaded. After more than 10 years of performing this routine, I miss the shade about 7 out of 10 times! I start it in the shade, try to estimate where the sun will be moving and then place it accordingly.
Today, I thought I nailed it. But when I returned to my truck, there was about a three inch slice of sunshine by the passenger door…right where my water bottle was…melting. I don't consider myself a dumb individual, but I may have never figured out a sun dial had I lived in sun dial times.