This is by Doug. Deanne's guest blogger..... My dad graduated from the University of California - Berkeley as a Civil Engineer. In one of his classes, he was the only student to come up with the formula that solved a problem a professor gave the entire class at the beginning of the semester. Needless to say, he was smarter than the average bear. (No pun intended for those of you who know what the mascot is for Berkeley.) All this was to give you the background as to why my father loved explaining the concepts of physics to me and my other siblings (and whoever else would listen) throughout my life. One of the most memorable of these instructional sessions was when I backed his pickup truck into a cement post. That was back in the late 70's when they built real bumpers with 1/4" steel that easily went through the grill of any car failing to stop at the appropriate distance at stop lights. After I hit the pole, though it gave me a pretty good jolt, I drove away wi