Operation Crossbow: How 3D Glasses Helped Defeat Hitler -- BBC
Newly released photographs show how a team of World War II experts disrupted Nazi plans to bombard Britain - with the help of 3D glasses like those in modern cinemas.
Hitler's deadly V-1 and V-2 missiles were early but effective weapons of mass destruction - unmanned flying bombs which brought terror to southern England.
But their impact could have been all the more devastating - costing thousands more lives, lengthening the war and threatening the D-Day landings - were it not for the fact that British intelligence worked in three, rather than two, dimensions.
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My Comment: I find it amazing that even though the war ended 66 years ago .... these secrets are still being released and publicized.