It is August and I am in the Sonoran Desert of Arizona seven miles from my truck with the temperature reaching over 110 degrees. I just reexamined my water supply for the umpteenth time and realized that I may not have enough water to get back to the truck in these conditions. I think to myself, what am I doing out here? Why am I subjecting myself to this torture? Then I realize that I have contracted the mysterious disease known as “sheep fever” and I have a full-blown case.