Dummies, goo-be-gone and Crichton's cosmic turd

Steve Jurvetson* cites this peer-reviewed publication's citation of what I'll call the Freitas Fry Factor: Nanobots may be able to gobble the globe in 2.78 hours, but they'll generate so much heat there will be plenty of time to detect the disaster and get the goo to chill.

But what can stop Crichton's cosmic turd?

* for whom I have the greatest admiration and (perhaps alone among all the unpaid, unfunded nanotechnology bloggers with big dreams) whom I recognize as nothing less than an entrepreneurial genius ...

Backgrounder
Three Nano Kings
Freitas on the future
Gray Goo Who?