05-20-2015, 07:14 PM
An excellent lecture and demonstration.
<!-- m --><a class="postlink" href="https://www.youtube.com/watch?v=ymG5htqeRLs">https://www.youtube.com/watch?v=ymG5htqeRLs</a><!-- m -->
<!-- m --><a class="postlink" href="https://www.youtube.com/watch?v=ymG5htqeRLs">https://www.youtube.com/watch?v=ymG5htqeRLs</a><!-- m -->