Molecular Assemblers (Advanced Nanotech)

Book Review: Nanofuture: What’s Next For Nanotechnology by J. Storrs Hall
This book provides some rather well informed insights into what molecular engineering will be able to do in a few decades. It isn’t as thoughtful as Drexler’s Engines of Creation, but it has many ideas that seem new to this reader who has been reading similar essays for many years, such as a solar energy collector that looks and feels like grass.
The book is somewhat eccentric in it’s choice of what to emphasize, devoting three pages to the history of the steam engine, but describing the efficiency of nanotech batteries in a footnote that is a bit too cryptic to be convincing.
The chapter on economics is better than I expected, but I’m still not satisfied. The prediction that interest rates will be much higher sounds correct for the period in which we transition to widespread use of general purpose assemblers, since investing capital in producing more machines will be very productive. But once the technology is widespread and mature, the value of additional manufacturing will decline rapidly to the point where it ceases to put upward pressure on interest rates.
The chapter on AI is disappointing, implying that the main risks of AI are to the human ego. For some better clues about the risks of AI, see Yudkowsky’s essay on Creating Friendly AI.

Book Review: FAB: The Coming Revolution on Your Desktop–From Personal Computers to Personal Fabrication by Neil Gershenfeld
This book brings welcome attention to the neglected field of personal, general-purpose manufacturing. He argues that the technology is at roughly the stage that computing was when minicomputers were the leading edge, is good enough to tell us something about how full-fledged assemblers as envisioned by Drexler will be used, and that the main obstacle to people using it to build what they want is ignorance of what can be accomplished.
The book presents interesting examples of people building things that most would assume were beyond their ability. But he does not do a good job of explaining what can and can’t be accomplished. Too much of the book sounds like a fund-raising appeal for a charity, describing a needy person who was helped rather than focusing on the technology or design process. He is rather thoughtless about choosing what technical details to provide, giving examples of assembly language (something widely known, and hard enough to use that most of his target users will be deterred from making designs which need it), but when he describes novel ideas such as “printing” a kit that can be assembled into a house he is too cryptic for me to guess whether that method would improve on standard methods.
I’ve tried thinking of things I might want to build, and I’m usually no closer to guessing whether it’s feasible than before I read the book. For example, it would be nice if I could make a prototype of a seastead several feet in diameter, but none of the examples the book gives appear to involve methods which could make sturdy cylinders or hemispheres that large.
The index leaves much to be desired – minicomputers are indexed under computers, and open source is indexed under software, when I expected to find them under m and o.
And despite the lip service he pays to open source software, the CAM software he wrote comes with a vague license that doesn’t meet the standard definition of open source.

(Catching up on month-old news…)

The most important technical news from the Foresight Conference on Advanced Nanotechnology was the presentation by Christian Schafmeister, who is working on building molecules with a wide variety of shapes out of bis-amino acids. He is able to build protein-like molecules that are rigid, and whose shape is easy to predict from the sequence. If there are no hidden catches, this may be an innovation as valuable (for the purposes of creating new objects to atomic precision) as solving the protein folding problem. The biggest drawback that he mentioned was the time it takes to synthesize a medium-sized molecule (up to a week), but he says that could be automated.

I’m unsure whether there was anything important in the other talks about nanotech research. Ned Seeman mentioned something about a ribosome-like device – I suppose that might be something important and new that he has done, but he didn’t say enough about it for me to tell.

Rob Freitas made some vaguely impressive claims about the feasibility of building a diamondoid assembler using the tools available today, but he went through some critical issues such as error rates in placing individual atoms where we want them to quickly for me to evaluate the plausibility of his answers. I’ll try to read the papers he has on his web site real soon now to see if he presents those arguments more convincingly there.

The best sound bite from the Foresight Conference on Advanced Nanotechnology was Chris Phoenix’s description of how mature versions of nanotechnology will deal with most forms of pollution:

No Atom Left Behind

He was responsible enough to point out one form of pollution that can’t be solved that way: a scarcity of heat pollution credits is likely to be an important feature of the nanotech economy.