Nice accessible writing. The subject matter, though, is just so abstract, so divorced from anything which could make an observable difference to the world, that it’s hard going, and difficult to understand why anyone should be interested.
Apparently, some very clever people spend their time wondering a) whether past and future are in some sense just as real as the present, even though they’re not currently being experienced; and b) whether empty space is something or nothing. Interesting questions to ponder on if you want to feel some sort of intellectual vertigo. But the answers offered, in the chapters I read before giving up, seemed to be pure speculation - by necessity, I guess.
Again, no criticism implied to the author, who gives a balanced overview of the subject and makes it as clear as possible.