The flaw which allowed the Allies to break the Nazi Enigma code.
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First video explaining Enigma:    • 158,962,555,217,826,360,000 (Enigma M...  
Extra footage:    • Video  
Brown papers on ebay: http://bit.ly/brownpapers
Periodic Videos:    / periodicvideos  

This video features Dr James Grime discussing Enigma, the Bombe and Alan Turing.

James' "day job" is touring with the Enigma machine - he could even visit you - see more at http://enigma.maths.org/content/proje...

The maths of breaking the Enigma by James Grime http://enigma.maths.org/content/sites...

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