Added media="screen" — So print stylesheets are unaffected.

assets/js/adapt.js

@@ -24,6 +24,7 @@
   // <link rel="stylesheet" />
   var css = d.createElement('link');
   css.rel = 'stylesheet';
+  css.media = 'screen';
 
   // Called from within adapt().
   function change(i, width) {

index.html

@@ -50,7 +50,7 @@ <h2>
       What is this?
     </h2>
     <p>
-      <a href="https://github.com/nathansmith/adapt/blob/master/assets/js/adapt.js">Adapt.js</a> is a lightweight (831 bytes <a href="https://github.com/nathansmith/adapt/blob/master/assets/js/adapt.min.js">minified</a>) JavaScript file that determines which CSS file to load before the browser renders a page. If the browser tilts or resizes, Adapt.js simply checks its width, and serves only the CSS that is needed, when it is needed.
+      <a href="https://github.com/nathansmith/adapt/blob/master/assets/js/adapt.js">Adapt.js</a> is a lightweight (848 bytes <a href="https://github.com/nathansmith/adapt/blob/master/assets/js/adapt.min.js">minified</a>) JavaScript file that determines which CSS file to load before the browser renders a page. If the browser tilts or resizes, Adapt.js simply checks its width, and serves only the CSS that is needed, when it is needed.
     </p>
     <p>
       A potential drawback of Adapt.js is the possibility of a brief flash of unstyled content as a new stylesheet is being fetched (think of it as “Ajax” for CSS). I have done my best to mitigate this by keeping CSS files small (3 KB). It is worth noting this is a proposed, not prescribed, approach to a problem with multiple solutions.