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I think 'what-if' is just fine. What-if has gotten us a long way as a species towards understanding things we might not have even approached. Look at Freud... generally speaking, a lot of rubbish (check out his explanation of the Eucharist, for example)... but he hit upon some VERY important ideas that were later fleshed out more sensibly.
I have this book myself. I've only skimmed it, but it's high on my reading list - Dawkins recommendation not withstanding.
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