From this weeks "Car Talk" puzzler (or Help me win a "Car Talk" coffee mug):
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Let me set the scene: it's World War II, an RAF airfield north of London. A dimly lit Quonset hut filled with air crews just returned from bombing runs over Germany.
The meeting opens with the chaplain leading the men in prayer for their lost comrades. He is followed by the flight operations chief, who begins the debriefing by asking the airmen, "From what direction were you attacked by the German fighter planes?"
Without hesitation or dissent, the reply was, "From above and behind."
The flight operations chief hastily scribbles the information on the back of top secret maps, and hands it to a junior officer with the instructions, "Get this information to the departing air crews. It may save their lives!"
As the officer turns to leave, from the inky shadows, a hand grasps his arm and he hears these words:
"Hold that order. The information you're about to give will lose lives rather than save them."
What did the guy from the inky shadows know that the flight operations chief didn't?
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Any ideas?