If you take all the factories in the world today, they could make all the parts necessary to build more factories like themselves. So, in a sense, we have a self-replicating industrial system today, but it would take a tremendous effort to copy what we already have.

in 1979 in Astro/Aerospace Engineering with a Master's thesis titled "Design of a High Performance Solar Sail System. '" Drexler had difficulty in getting Smalley to respond but in December 2003 Chemical and Engineering news carried a 4 part debate.

His 1991 doctoral thesis at Massachusetts Institute of Technology was revised and publiK. Eric Drexlerd as the book Nanosystems: Molecular Machinery Manufacturing and Computation (1992) which received the Association of American PubliK. Eric Drexlerrs award for Best Computer Science Book of 1992.