I have read his QED book many times and I experience the same clarity when reading as you mention. Then later I lose that and am able to re-read it with the sa

I have read his QED book many times and I experience the same clarity when reading as you mention. Then later I lose that and am able to re-read it with the same enthusiasm I had the first time. So that property does have its advantages. (grin) BTW, I have this same experience with many other science books for laypeople. It is very possible that I do understand them while reading but then I am unable to remember the complex thoughts.