Eric Drexler’s recent post on how concepts often “round to false” as they shed complexity and gain memetic fitness discusses a case study personal to him, that of atomically precise mass fabrication, which seems to describe a textbook cowpox-ing of doubt dynamic:
The history of the concept of atomically precise mass fabrication shows how rounding-to-false can derail an entire field of inquiry and block understanding of critical prospects.
The original proposal, developed through the 1980s and 1990s, explored prospects for using nanoscale machinery to guide chemical reactions by constraining molecular motions6. From a physics perspective, this isn’t exotic: Enzymes guide substrate molecules and provide favorable molecular environments to cause specific reactions; in molecular manufacturing, synthetic molecular machines would guide strongly reactive molecules to cause specific reactions. In both cases, combining specific molecules in precise ways results in atomically-precise products, and all the microscopic details are familiar.
However, in the popular press (see, for example, Scientific American7) building atomically precise structures became “building atom by atom”, which became “nanobots with fingers that grab and place individual atoms”, stacking them like LEGO blocks. Despite technically specific pushback (see Scientific American again8), the rounded version became the overwhelmingly dominant narrative.
The rounded version is impossible, chemically absurd. Atoms that form strong bonds can’t be “picked up” and “put down” — bonding follows chemical rules that aren’t like anything familiar at larger scales. Molecules have size, shape, and rigidity, but their atoms bond through electron sharing and charge distributions, not mechanical attachment.9 Confusing constrained chemistry with fingers stacking atoms creates a cartoon that chemists rightly reject.10
A committee convened by the US National Academy of Sciences reviewed the actual technical analysis in 2006, finding that “The technical arguments make use of accepted scientific knowledge” and constitute a “theoretical analysis demonstrating the possibility of a class of as-yet unrealizable devices.”11 The committee compared the work to early theoretical studies of rocket propulsion for spaceflight. Yet to this day, the perceived scope of technological possibilities has been shaped, not by physical analysis of potential manufacturing systems,12 but by rejection of a cartoon, a mythos of swarming nanobots.13 The episode inflicted reputational damage that facts have not repaired. But let’s change the subject. Look! A deepfake cat video!
Picture a robotic arm that reaches over to a conveyor belt, picks up a loaded tool, applies the tool to a workpiece under construction, replaces the empty tool on the belt, picks up the next loaded tool, and so on-as in today’s automated factories.”
, made by… Eric Drexler in the Scientific American article he cites as his “technically specific pushback.”
Eric Drexler’s recent post on how concepts often “round to false” as they shed complexity and gain memetic fitness discusses a case study personal to him, that of atomically precise mass fabrication, which seems to describe a textbook cowpox-ing of doubt dynamic:
Eric Drexler pushing back against statements like
, made by… Eric Drexler in the Scientific American article he cites as his “technically specific pushback.”
This quote is perfectly consistent with