title: What means '2e4' in code
body: <p>This example <a href="http://raphaeljs.com/gear.html" rel="noreferrer">http://raphaeljs.com/gear.html</a>
  has following code:</p>
  
  <pre><code>function run() {
                  e.animate({along: 1}, 2e4, function () {
                      e.attr({along: 0});
                      setTimeout(run);
                  });
              }
  </code></pre>
  
  <p>What means "2e4" in this example and how it works?</p>