Runner-up:

Long wanted to read more about Scottish Enlightenment (what was in the water?!); turns out Herman's book is great:

The other book was “How the Scots Have Helped Create the Modern World.” That’s a subject that’s always interested me, how a tiny, poor, little population of Celtic people had such a huge favorable impact on the world, starting from poverty.

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And, of course, it’s related to the Irish, who were a similar ethnic strain with a different religion.

And, it was marvelous book. And I forget the author’s name, but I recommend both of those books to all of you.