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Looking back and forth, between the puzzle and her son, Lippman says she initially regarded the offer with skepticism. "I asked Richard if he'd read the magazine," she says. "He told me that, yes, he had and what's more he'd already solved the puzzle. The next thing I know, he starts explaining to me how to solve it."

Two years after the explosion, the rate of innovation began to exhibit dangerous side effects. The explosive growth had provided an exciting validation of the collaborative hacker approach, but it had also led to over-complexity. "We had a Tower of Babel effect," says Guy Steele.

Over the next few years, Bostic and other University of California employees worked to replace the missing components and turn BSD into a complete, freely redistributable operating system. Although delayed by a legal challenge from Unix Systems Laboratories-the AT&T spin-off that retained ownership of the Unix brand name-the effort would finally bear fruit in the early 1990s. Even before then, however, many of the Berkeley utilities would make their way into Stallman's GNU Project.

By the spring of 1985, Richard Stallman had settled on the GNU Project's first milestone-a Lisp-based free software version of Emacs. To meet this goal, however, he faced two challenges. First, he had to rebuild Emacs in a way that made it platform independent. Second, he had to rebuild the Emacs Commune in a similar fashion.

With no dorm and no dancing, Stallman's social universe imploded. Like an astronaut experiencing the aftereffects of zero-gravity, Stallman found that his ability to interact with nonhackers, especially female nonhackers, had atrophied significantly. After 16 weeks in the AI Lab, the self confidence he'd been quietly accumulating during his 4 years at Harvard was virtually gone.

With no dorm and no desire to return to New York, Stallman followed a path blazed by Greenblatt, Gosper, Sussman, and the many other hackers before him. Enrolling at MIT as a grad student, Stallman rented an apartment in nearby Cambridge but soon viewed the AI Lab itself as his de facto home.

Dan Chess, a fellow classmate in the Columbia Science Honors Program, recalls Richard Stallman seeming a bit weird even among the students who shared a similar lust for math and science. "We were all geeks and nerds, but he was unusually poorly adjusted," recalls Chess, now a mathematics professor at Hunter College. "He was also smart as shit. I've known a lot of smart people, but I think he was the smartest person I've ever known."

Such comments reflect the sense of humor that comes with raising a child prodigy. Make no mistake, for every story Lippman hears and reads about her son's stubbornness and unusual behavior, she can deliver at least a dozen in return.

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 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.