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@@ -395,31 +395,6 @@ <h2>Metaprogramming: <code>def</code></h2>
         </section>
       </section>
 
-    <section>
-      <section>
-        <h2>API gotchas</h2>
-
-        <ul>
-          <li class="fragment" data-fragment-index="1"><code>#includes?</code> instead of <code>#include?</code></li>
-
-          <li class="fragment" data-fragment-index="2">Only <code>#reduce</code>, no <code>#inject</code></li>
-          <li class="fragment" data-fragment-index="2">Only <code>#size</code>, no <code>#length</code></li>
-
-        <!--div class="fragment">
-          <p><code>Time.utc</code>/<code>Time.local</code> instead of <code>Time.now</code></p>
-        </div-->
-        </ul>
-
-        <aside class="notes">
-          <p>Overall, the standard library has very many similarities</p>
-          <p>but there are some explicit choices</p>
-          <p>better grammar</p>
-          <p>avoid aliases</p>
-          <p>Easier for newcomers</p>
-          <p>No need to learn two things when one suffices</p>
-        </aside>
-      </section>
-
       <section>
         <h2>Concurrency</h2>
         <ul>