For those who like to watch talks, I found one on youtube:
<a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=QW1OEQxcjZc" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=QW1OEQxcjZc</a>