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Dog happy to see me. And others, of course. After 25.5 days, 4 countries, 5 airports, 8 flights by 5 airline companies, 2 panels, 2 lectures, 4 radio interviews, 2 newspaper interviews, 2 blogger meetups, and many good meals, I am mentally exhausted. Need to spend some time with the family. Offline. Feet up. Will see you all on Monday (may post the rest of Berlin pictures tomorrow, lazily).

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Joey Bernard, who writes about science under Linux, has just started a multi (as in two?) part series on GSL, the GNU Scientific Library. It is here. Just browsing through the files of GSL is fun.
I'll return to my Dawkins series later in the week. But after all our exertions recently trying to resolve the mysteries of the universe, I find myself in the mood for a straight math post.
I know what you're thinking. You're thinking, “Gosh, it sure is neat that we can generate all Pythagorean triples from one simple formula, but what happens if we try an exponent bigger than two?
As an introduction to a mathematical game, and how you can use a little bit of math to form a description of the game that allows you to determine the optimal strategy, I'm going to talk a bit about Nim.