My Cat Ilsa Went to Heaven: "Just Six Numbers: The Deep Forces That Shape the Universe" by Martin Rees
(original review, 2000)
If there was an infinite number of universes wouldn't there be a universe in which a mad scientist had discovered how to destroy all the universes and pressed the button, so there would be nothing at all? But then there would also be a good scientist who devised a plan to stop the mad scientist from pressing the button in the first place! What if they are one & the same, who wins? But as with Madeira Island's Nationalism, the bad scientist would only have to succeed once.
If you're into stuff like this, you can read the full review.
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