"officer's training at the Army's Aberdeen, Md., Proving Ground, our class received instruction on sophisticated equipment. During one class, I was fascinated by an expensive-looking computer. The instructor bragged that it was able to withstand nuclear and chemical attacks. I was duly impressed. But then the instructor abruptly stopped his lecture and turned to me. "Lieutenant, there will be no eating or drinking in my class," he snapped. "You'll have to get rid of that coffee!" "Sure . . . but why?" I inquired meekly. "Because," he scolded, "a coffee spill could ruin the keyboard." -- JEANNE T. WHITAKER"