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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><a name="_MailEndCompose"><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>Excellent! Thanks John.<o:p></o:p></span></a></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> extropy-chat [mailto:extropy-chat-bounces@lists.extropy.org] <b>On Behalf Of </b>John Clark<br><b>Sent:</b> Friday, January 22, 2016 9:27 AM<br><b>To:</b> ExI chat list<br><b>Subject:</b> Re: [ExI] Smalley vs. Drexler & 3 Dimensions<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>On Thu, Jan 21, 2016 at 9:23 PM, <<a href="mailto:natasha@natasha.cc" target="_blank">natasha@natasha.cc</a>> wrote:<o:p></o:p></span></p></div><div><div><p class=MsoNormal><o:p> </o:p></p></div><div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in'><div><div><p class=MsoNormal><span style='font-family:"Arial","sans-serif"'>> <o:p></o:p></span></p></div><p class=MsoNormal>One of my students ask if Drexler or anyone offered an engineering solution to Smalley’s juggling (<span style='font-size:10.0pt'>Rotman, 1999)</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'> issue that nanorobots would have to deal with three dimensions of control while maintaining atoms? Students are having a fascinating discussion on the seminal debate and I simply don’t have knowledge on this juggling issues.</span><o:p></o:p></p></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal> <o:p></o:p></p></div><div><div><p class=MsoNormal style='mso-line-height-alt:10.3pt'><i><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:#5B5B5B'>"<o:p></o:p></span></i></p></div><p class=MsoNormal style='mso-line-height-alt:10.3pt'><i><span style='font-size:13.5pt;font-family:"Verdana","sans-serif";color:#5B5B5B'>The importance of the number of reactants lies in Smalley’s argument that “There just isn’t enough room in the nanometer-size reaction region to accommodate all the fingers of all the manipulators necessary to have complete control of the chemistry.” <o:p></o:p></span></i></p><div><p class=MsoNormal style='mso-line-height-alt:10.3pt'><i><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:#5B5B5B'>[...]<o:p></o:p></span></i></p></div><p class=MsoNormal style='mso-line-height-alt:10.3pt'><i><span style='font-size:13.5pt;font-family:"Verdana","sans-serif";color:#5B5B5B'> The argument collapses when we observe that chemical reactions often involve two reactants, such as in the controlled vacuum conditions used by the scanning tunneling microscope (STM). Two reactants can be brought together with controlled trajectories if one reactant is bound to a substrate and the second reactant is positioned and moved by a single “finger” as has already been done experimentally. For example, Ho and Lee physically bound a CO molecule to an iron atom on a silver substrate using an STM. Other approaches are also possible, Brenner et al. provided a molecular dynamics simulation of the hydrogen abstraction reaction from a diamond substrate.<o:p></o:p></span></i></p><div><p class=MsoNormal style='mso-line-height-alt:10.3pt'><i><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:#5B5B5B'>"<o:p></o:p></span></i></p></div></div><div><div><p class=MsoNormal style='line-height:10.3pt'><span style='font-size:8.5pt;font-family:"Arial","sans-serif";color:#5B5B5B'><o:p> </o:p></span></p></div></div><div><div><p class=MsoNormal style='mso-line-height-alt:10.3pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:#5B5B5B'>From:</span><span style='font-family:"Arial","sans-serif";color:#5B5B5B'><o:p></o:p></span></p></div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal style='mso-line-height-alt:10.3pt'><span style='font-family:"Arial","sans-serif";color:#5B5B5B'><o:p> </o:p></span></p></div></div><div><div><p class=MsoNormal style='mso-line-height-alt:10.3pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:#5B5B5B'><a href="http://www.imm.org/publications/sciamdebate2/smalley/">http://www.imm.org/publications/sciamdebate2/smalley/</a></span><span style='font-family:"Arial","sans-serif";color:#5B5B5B'><o:p></o:p></span></p></div></div><div><div><p class=MsoNormal style='mso-line-height-alt:10.3pt'><span style='font-family:"Arial","sans-serif";color:#5B5B5B'><o:p> </o:p></span></p></div></div><div><div><p class=MsoNormal style='mso-line-height-alt:10.3pt'><span style='font-family:"Arial","sans-serif";color:#5B5B5B'><o:p> </o:p></span></p></div></div><div><div><p class=MsoNormal style='mso-line-height-alt:10.3pt'><span style='font-size:13.5pt;font-family:"Arial","sans-serif";color:#5B5B5B'>John K Clark</span><span style='font-family:"Arial","sans-serif";color:#5B5B5B'><o:p></o:p></span></p></div></div><div><p class=MsoNormal> <o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p></div></div></div></body></html>