 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.Drexler and coworkers responded to these two issues in a 2001 publication.Drexler and colleagues noted that Drexler never proposed universal assemblers able to make absolutely anything, but instead proposed more limited assemblers able to make a very wide variety of things.