In just over 6 hours, as I write this, the phased-array radars and Keyhole look-down satellites of North American Air Defense Command will begin performing the task for which they were really created -- you didn't fall for that whole "Cold War" cover story, did you? Yes, on Christmas Eve the NORAD Santa Tracker system goes on line once again. And now you can even get updates to your mobile device, in case you feel like following Santa around in person.
And to all, a good night.
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