Update index.html

docs/module2/index.html

@@ -51,7 +51,7 @@ <h2>Producing Order</h2>
   When you run into this situation, you put the cat in your arms into the gap and pick up the darker cat, if there is one. Then you compare the cat you just
   picked up with the one on the right of the new gap. Once you get to the end of the row, you have to go back to the beginning of the row, the cat on the
   furthest left, and go again. Do you see the repetition? Do you see the comparison done? To get all of the cats in order you have to keep doing this until
-  you don&rsquo;t move any cats. Then you&rsquo;re done!&#127881;&#127881; It can be a little hard to envision this in your mind. You should watch <a href="https://youtu.be/MtcrEhrt_K0"> an animation of bubble sort</a> to help with that.
+  you don&rsquo;t move any cats. Then you&rsquo;re done!&#127881;&#127881; It can be a little hard to envision this in your mind. You should watch <a href="https://www.youtube.com/watch?v=GNDKoU2EJPo"> an animation of bubble sort</a> to help with that.
 </p>
 <p>
   I think they misnamed this. To me <a href="https://www.britannica.com/video/185615/liquefaction-event-soil-particles-earthquake-combination-water">liquefaction</a> sort sounds like a better name. In liquefaction, heavy things sink and light things float. To me, that&rsquo;s what the algorithm seems to be doing. But that&rsquo;s just me.&#129322;