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I've never seen one of my books at an airport store, but this'll do just fine. Now I’m imagining you going around signing articles in airport bookstores like @neilhimself.neilgaiman.com - I’d buy such a collector’s item! I'm not sure they'd let me sign magazines. I once signed an S&T issue with a cover article of mine in a bookstore in Texas. The clerk even slapped a sticker on it. Ha! But I have an article on every issue now. Might dilute the value. Jerry Oltion (Astronomer’s Workbench) is my neighbor, a good friend, and a great guy! 
