For “writing” read “Google” and you have much of the burden of current worries about how use of the internet may be degrading our minds. Writing itself is just as much an external prosthetic technology (“characters which are no part of themselves,” as the Egyptian king complains) as the internet is. Writing is also a tool of extended cognition. The difference is that we have had thousands of years to get used to it. The truth about the question of whether our reliance on modern electronic prostheses is better or worse for us is that it’s simply too early to tell.