Moses of the Nanoworld

It’s a lovely northern california day early last November, and you would expect K. Eric Drexler to be pleased. By almost any measure, his Foresight Institute’s conference on nanotechnology is a raging success. After years of struggling to gain the respect of the mainstream research community, the meeting has hit the scientific big time.

But Eric Drexler, the longtime popularizer of nanotech, is clearly not happy. Grasping the podium angrily, the chairman and founder of the Foresight Institute tears into his lunchtime speech, leading off with harsh words. “My mentor at MIT, Marvin Minsky, advocated rudeness as a means of promoting scientific progress,” begins Drexler. He then proceeds to savage his critics, dismiss past magazine articles as “attack pieces,” and bemoan the lack of serious research into nanotechnology.

Some of Drexler’s remarks are tongue-in-cheek, such as when he reveals that the reason he has never been turned down for a federal grant is because “I haven’t applied for any.” But he is not joking when he maintains that “there is no controversy” over who’s right about nanotechnology. There isn’t a debate, he rails, there is just one side-his. Very small machines will be built, will make anything we want, and will transform civilization as we know it. What about those who dispute the vision? He says that he has asked people to give technical criticisms of his ideas and still hasn’t found anyone whose arguments stand up.

The audience, a mixture of nanotech aficionados and professional researchers, listens in polite silence. No one rises to argue. Afterward, it’s difficult to judge reactions. But some are clearly annoyed. Says one researcher, “I don’t believe in anyone’s utopia. It’s too much like those magazine stories in the 1930s, predicting that all of us would be riding around in our little gyrocopters in the future.”

Welcome to the nanotech culture wars. On one side is the Drexler-led contingent, which includes computer scientists, technology buffs and believers in cryonics; on the other side is the community of mainstream researchers in physics, chemistry and materials science. Despite Drexler’s self-professed belief in the value of rudeness, however, there is little mudslinging in evidence at the Foresight meeting. Most of the back-and-forth is couched in the cautious words of scientific debate. Indeed, many in the research community simply prefer to ignore Drexler’s ideas as an unwanted distraction.

There is, in fact, ample evidence at the conference that the two cultures-nanoenthusiasts and serious researchers-are floating past each other, largely oblivious to the other’s ideas. But make no mistake about it: At stake is the heart and soul of nanotech-or, at least, the public’s and mass media’s perception of this fledgling field.

Since the early 1980s, Drexler has championed a utopian vision of synthetic molecular nanomachines made of subminuscule mechanical parts-actual gears and axles on the molecular scale-that would cure human illness, eliminate poverty and wipe away environmental pollution. Drexler has also warned that nanoweapons unleashed against the world could wreak mass destruction. In short, it’s a belief that nanotech will change everything.

In spite of his status as the field’s foremost evangelist, Drexler didn’t actually coin the word “nanotechnology.” (Japanese researcher Norio Taniguchi created it in 1974 to mean precision machining with tolerances of a micrometer or less.) But Drexler brought the word and the field into the public mind, popularizing his version of molecular manufacturing in a 1986 book Engines of Creation and adding an exhausting level of detail in a 1992 book, Nanosystems. Both volumes depicted a future in which self-replicating nanorobots (“assemblers,” in Drexler-speak) would manufacture batches of any material permitted by the laws of nature, one atom at a time. And, predicted Drexler, all this would come to fruition in a few decades.

Despite that ever-widening circle of believers, however, Drexler’s ideas have largely failed to win over the scientific mainstream (p. 46). A number of researchers give Drexler and the Foresight Institute credit for generating interest in nanotech, but few experimenters in chemistry, physics or materials science buy the concept of mechanical assemblers inhabiting a microscopic factory floor. “I don’t think that there is any more enthusiasm for most of these ideas now than at the beginning. If anything, less, as the real, science-based expertise in nanofabrication increases,” says Harvard University chemist George Whitesides, a pioneer in molecular self-assembly. “Still, Eric was captivated by the vision early on, and he deserves credit for his willingness to try to imagine what that world might be.”

One pointed criticism of the Foresight Institute is that, in the face of a growing understanding of nanoscale science, Drexler has steadfastly refused to change his original notion of nanotech as being a miniature robotic world. Although Drexler declined repeated requests by TR for an interview, his colleagues defend the assembler notion. Ralph Merkle, for example, a director of Foresight and a computer scientist at Xerox Palo Alto Research Center, says self-replicating assemblers with robotic arms moving atoms around remains the most likely route to the nanoworld. “Computer scientists are very comfortable with the idea,” says Merkle. “You can do it on a computer.” He acknowledges, however, it “will take time” to convince many chemists and physicists.

The Foresight Institute has also been tainted in the eyes of mainstream researchers by an association with fringe technological elements. It has, for instance, close ties with the cryonics movement, in which people pay to have themselves frozen immediately after death in the hope that they can eventually be thawed out and returned to the living. Merkle is a director of Alcor Foundation, a nonprofit cryonics business, while Drexler is on the scientific advisory board. (During his after-lunch speech at the meeting, Drexler called the fact that cryonics is not part of the country’s health care policy a “national disgrace.”)

This embrace of a decidedly nonmainstream notion may have alienated some potential allies, but Merkle says it is important to expose people to the consequences of cryonics, a technology he is sure will come about. And, he says, nanotech and cryonics may be linked up in the future. He argues that nanotech will revolutionize the practice of medicine as nanomachines repair damaged tissue. The purchasers of cryonics services, he explains, expect that their mental “software” can eventually be downloaded to the new, improved “hardware.”

In the minds of many, the burgeoning field of nanotech is no longer identified with-or dependent on-Eric Drexler’s vision of molecular manufacturing. The science has gained its own momentum, forming its own picture of a nanoworld. And while it may not meet Drexler’s grandiose expectations, nanotech is, in some ways, growing bigger and more inclusive than many scientists would have ever thought possible. Yet in doing so, it may have left its conceptual progenitor behind.