I just watched the same video and it was one of the most insightful things that I have seen recently. Feynman is simply acknowledging that there are a few things in physics which are very difficult reduce to layman concepts. The other bit, about &quot;why questions&quot;, is also quite interesting. I have come to believe that a lot of questions which sound very interesting, like &quot;why do I exist?&quot;, don&#x27;t really have good answers, and probably will never have. e.g. if it did turn out that we are living in a matrix, the question will simply reduce to &quot;why does the matrix exist?&quot; and soon. Thats what Feynman is trying to point out that &quot;Why something happens?&quot; is not a complete question unless we agree to some understanding beforehand. Otherwise you just go deep into the rabbit hole.