Editing Molecular assembler (section)

==Drexler and Smalley debate==
{{main|Drexler–Smalley debate on molecular nanotechnology}}

One of the most outspoken critics of some concepts of "molecular assemblers" was Professor [[Richard Smalley]] (1943–2005) who won the [[Nobel prize]] for his contributions to the field of [[nanotechnology]]. Smalley believed that such assemblers were not physically possible and introduced scientific objections to them. His two principal technical objections were termed the "fat fingers problem" and the "sticky fingers problem".  He believed these would exclude the possibility of "molecular assemblers" that worked by precision picking and placing of individual atoms. Drexler and coworkers responded to these two issues<ref>{{cite web|url=http://www.imm.org/SciAmDebate2/smalley.html|title=Institute for Molecular ManufacturingDebate About Assemblers — Smalley Rebuttal}}</ref> in a 2001 publication.

Smalley also believed that Drexler's speculations about apocalyptic dangers of self-replicating machines that have been equated with "molecular assemblers" would threaten the public support for development of nanotechnology. To address the debate between Drexler and Smalley regarding molecular assemblers ''[[Chemical & Engineering News]]'' published a point-counterpoint consisting of an exchange of letters that addressed the issues.<ref name="counterpoint"/>