Illustration credit: I would like to thank sxc.hu and Mario Alberto Magallanes Trejo of Saltillo, Coahuila, Mexico for the use of the photograph, shot using car headlights and the spray from a garden hose at night!* * *Last night I drove with my elder son to see a wrestling meet at Mount Markham. My third child started wrestling last year and is a bit of a nut about it--he is altogether sports