(SOUNDBITE OF MARIUS CONSTANT'S "THE TWILIGHT ZONE THEME")
STEVE INSKEEP, HOST:
Enter another dimension, a dimension not of sight and sound but of drones. A U.S. Army drone was on a training flight over southern Arizona and vanished. A hiker later found it stuck in a tree 600 miles away in Colorado. Nobody knows how the $1.5 million aircraft got there. Apparently, the operator on the ground didn't fly it, which raises the possibility that drones, unmanned aerial vehicles, have begun flying themselves. It's MORNING EDITION.
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