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THERE MUST BE SOMETHING PRIMAL about big trucks, something that draws Riley to the noise and excitement. Work trucks are big, brightly colored, loud. They are stronger than anything in his daily life, and they probably seem unpredictable in a wonderful way. They are rough, electricnaildrills with a potential for destruction not unlike his own impulse to hit, kick, pinch, and bite when he is frustrated. He and I spend a lot of time in our car, too -- a much milder sort of machine -- so he knows all about piloting large metal vehicles down the road. If Mama seems powerful driving the car, think how omnipotent a boy must appear in his imagination, perched behind the wheel of a backhoe. In an earlier era, a toddler might have watched men with bows and arrows, or a brace of oxen, and would have been given his own, boy-size replicas to play with. But nowadays, diggers and dumpers are what introduce him to that important, yearned-for, grown-up world. When Riley first became interested in construction vehicles, I would sometimes shyly, casually approach moms of girl toddlers. "Does she ... like trucks?" I would electricnaildrills ask, usually earning a pitying look in reply. "Oh, sure, she likes them, but she''s not crazy about them." Well, Riley is crazy. Absolutely nuts. Lately, as I try to keep him from stomping ants and bullying other kids, I''ve been wondering if maybe it really is a boy thing, as people electricnaildrills say. Something to do with his biological makeup. "A boy''s being vibrates to the rhythm of testosterone," say Don and Jeanne Elium in their sometimes infuriating but always interesting book Raising a Son: Parents and the Making of a Healthy Man. This hormone, they say, drives boys and men through a repetitive cycle of emotional buildup and eventual, sometimes-violent release. More benignly, it makes them really like trucks, with these machines'' barely contained violence, power, glorious potency, and superior force. Trucks are, let''s face it, cool!

In 1936 Henry F. Phillips, also once a traveling salesman, patented the cruciform head known to us all. It was first used by electricnaildrills General Motors in the 1936 Cadillac, and within three years most screw makers produced Phillips head screws under license from the inventor.The first screwdriver the author found was in the late fifteenth-century castle manual cited above. It appears in the careful drawing of a screw-cutting lathe and was used to adjust the cutter. "Eureka!I''ve found it. The first screwdriver. No improvised gadget but a remarkably refined tool, complete with a pear-shaped wooden handle to give a good grip, and what appears to be a metal ferrule where the metal blade meets the handle....there is no doubt that a full-fledged screwdriver existed three hundred years before the tool portrayed in the Encyclopedie." Since the lathe was shown in a chapter devoted to machines of war "it is likely that screwdrivers appeared first in military workshops, though perhaps not in France, as I had assumed, but in Germany electricnaildrills.

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