title: NSIndexpath.item vs NSIndexpath.row
body: <p>Does anyone know the difference between <code>NSIndexpath.row</code> and <code>NSIndexpath.item</code>? </p>
  
  <p>Specifically, which one do I use in:</p>
  
  <pre><code>-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath;
  </code></pre>