but I appreciate your thoughtful comment.  Here's my comment on the Technology Review post that I believe you were responding to: "To believe that humans can develop technologies in a decade that improve upon the exquisitely complex mechanisms that have evolved over billions of years —  when we don't yet understand the fundamental workings of the cell — strikes me as the height of hubris. It is of course important to aspire and experiment, but equally so to come to terms with our own aging and mortality." Cells are a lot more complicated than chips. And while these technologies will undoubtedly produce medical breakthroughs, they will be available to very few.