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alternatehistory.com
Just finished reading the book - you can find a description of the plot on wikipedia - and was wondering how plausible many of the actual alt-history plot twists are. One in point was the steamships on the Nile in the first millennium AD.
PS: I don't know if this is the right forum to post this in, but it seemed as good a place as any since it involves the alt-history of the book rather than the actual book itself.