Nick's Essays in Theoretical Applied Science 
                       Theoretical Applied Science
Self-Reproduction & Agile Manufacturing
Drexler Assemblers & The Origin of Life
Comet Mining -- An Overview
Stopping a Comet: The Needle & Thread Method
 Green Goo
Green Goo
Smart Contracts (original article)
Other Essays and References
How Much Energy Does it Take to Send a Bit?
 
Reversible Logic
Internet in Orbit (by George Gilder)
As We May Think (by Vannevar Bush)
MIT 6.270 LEGO Robot Design Competition
Three Dimensional Printing
Nanotechnology on the WWW