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The anger eventually drove her son to focus on math and science all the more. Even in the realm of science, however, her son's impatience could be problematic. Poring through calculus textbooks by age seven, Stallman saw little need to dumb down his discourse for adults. Sometime, during his middle-school years, Lippman hired a student from nearby Columbia University to play big brother to her son.

Lippman, on the other hand, entertains the possibility. She recalls a few stories from her son's infancy, however, that provide fodder for speculation. A prominent symptom of autism is an oversensitivity to noises and colors, and Lippman recalls two anecdotes that stand out in this regard.

Almost a quarter century after its publication, Stallman still bristles when hearing Weizenbaum's "computer bum" description, discussing it in the present tense as if Weizenbaum himself was still in the room. "He wants people to be just professionals, doing it for the money and wanting to get away from it and forget about it as soon as possible," Stallman says. "What he sees as a normal state of affairs, I see as a tragedy."

The belief in individual freedom over arbitrary authority extended to school as well. Two years ahead of his classmates by age 11, Stallman endured all the usual frustrations of a gifted public-school student. It wasn't long after the puzzle incident that his mother attended the first in what would become a long string of parent-teacher conferences.

Seated at the dining-room table of her second Manhattan apartment-the same spacious three-bedroom complex she and her son moved to following her 1967 marriage to Maurice Lippman, now deceased-Alice Lippman exudes a Jewish mother's mixture of pride and bemusement when recalling her son's early years. The nearby dining-room credenza offers an eight-by-ten photo of Stallman glowering in full beard and doctoral robes. The image dwarfs accompanying photos of Lippman's nieces and nephews, but before a visitor can make too much of it, Lippman makes sure to balance its prominent placement with an ironic wisecrack.