you might want to watch this lecture by Searle at Google:
<a href="https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=rHKwIYsPXLg" rel="nofollow">https:&#x2F;&#x2F;www.youtube.com&#x2F;watch?v=rHKwIYsPXLg</a>