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Best of all, her closing lines answer the question "Why do this?" as well as any I've ever read. I'm tempted to quote them, but then you might be tempted to not read the book yourself. So I won't...so you will.
p.s. On a space-related note, if you've ever hankered after a book signed by an Apollo astronaut who's flown to the moon, I'll be giving one away in a few days, so stay tuned!