I prefer using metric, but can work in imperial if truly pressed, with one exception - pounds (force) and pounds (mass), and the difference is a slug. Arrrrrrgggggg! I'm old enough that I had to answer physics problems in both systems, but I always converted imperial problems to metric to avoid the force/mass confusion, and converted the answer back at the end. Canada officially converted to metric in the late 1970's. I don't know my weight and height in kg and cm, but in pounds, feet and inches. I know how many km I pedal my bike to work, but not miles. I know how cold it is in C when I cross country ski 10 km at the x-c area, elevation 1500 feet. Maybe my children will get this sorted out. Lyle Killough -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body