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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, 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 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 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!

Controlling the Integrated Water-Recovery SystemIn this section, we describe the control tasks for the final IWRS system that went into test in 2001, first by subsystem and then for the IWRS as a whole (figure 8).The Biological Water ProcessorFeed water from the waste-water collection system (figure 3) first passes through the BWP. The main control task for the BWP is to keep the water in the gas-liquid-separator (GLS) (see the lozenge icon with the three-level switches in the upper left of figure 8) at mid-level, which is accomplished by varying the speed of the feed pump, and the draw from the reverse-osmosis main pump remains constant. The other requirement is to monitor the pressures in the recycle loop, as well as in the nitrifier tubes, and carry out automatic shutdown procedures in the case of off-nominal values. For example, if one of the nitrifier tubes shows too high a pressure, the water and air pumps associated with this tube are shut down, and a warning is issued.

1. You need a firmly packed base of dirt to place the hoops for minimal seepage.2. The biggest problem with hoops is treatment of individual animals. Struthers uses hinged sorting panels and walks through each barn daily to check for sick animals.3. Quality bedding is a top priority. "We bought our own round baler because we treat cornstalks as a main crop now," says Struthers. Bean stubble works, too, he says, but it is not quite as absorbent as handicapped cornstalks.4. "Don''t skimp on bedding," says Struthers. "If you think the pigs might need more bedding, they do."Husbandry helpProducts that help with animal husbandry receive frequent mention in the survey. Breeding and selection management products get special acclaim from producers.