1None of these properties have values set, as far as we know, by fundamental laws
2of nature, and quite moderate alterations produce imagined universes with
3substantially less complexity than our own = universes where galaxies, stars,
4planets, molecules, atoms or even nuclei cannot exist. Life is, if nothing else,
5complexityunmatched and it stretches credulity to suggest that universes that
6cant even make atoms could somehow generate life. Its conceivable that the
7values of physical constants in our Universe are the only possible, but the
8alternative explanation, that multiple universes are actually realised in nature
9and that we necessarily live in one of the few where the constants are \quote
10{just right}, is surely a fascinating idea worth pursuing.
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