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For years I've entertained a fantasy about air travel that I'm sure
many of you share. You're staring out the cabin window, watching the
landscape scroll tailward, and some feature catches your eye: a
building, a highway, a lake, a ridge. You touch the window and a
heads-up display fades into view. It's kind of like Google Earth, but
live and in realtime. You summon and dismiss layers of annotation, and
you bookmark locations for later study.
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