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(Jon sez:)

Your Writer: Jon Kilgannon It's these guys again. They were last seen on or around page 360, moving their moon. They're considered armed (with ridiculously powerful weapons and esoteric military strategies) and dangerous.

This is apropos of nothing; however, since I love plate tectonics, I'm going to talk about them. The movement of tectonic plates is usually pretty slow - an interesting (and very rough) rule of thumb I learned in school is that North America moves away from Eurasia the height of a person in a human lifetime. But in Ethiopia, the land moved eight meters in a month. The process will probably open a new sea in a million years or so.

Yes, loving plate tectonics makes me a massive science geek. But I don't care. It means that I can be fascinated by the geological strata in a cut made through a hill for a highway pass. And anything that makes a long car trip more interesting is not to be sneezed at.

(Mark sez:)

Your Artist: Mark Sachs Radar imagery of Titan from the Cassini probe. Enjoy.