In the confines of extension

This book takes as many Etienne Klein interventions on France Culture (fleshing out) the content of 5 one-hour programs each, were broadcast in 2011 I believe, on the same channel and whose generic title was " Five slightly metaphysical questions "(or something similar). They are probably still re listenable and I highly recommend it. Five hours of enjoyment guaranteed!
This allusion to the "recovery" is therefore in no way a criticism.
M Klein has a dual training, scientific and philosopher and, besides a good dose of humor, his words and his writings are always exciting. This is, in my opinion, a popularizer of great talent and, precisely in this book, we perceive that even with professional skill, it has its limits, those where the only non-mathematical language is powerless to describe or express some physical realities. It may rage, cry, protest, it is so! Another solution is to learn the language ......
PS: I'm not a mathematician!