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Peter Pustaj
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How Does a Key Work?

The key is inserted into a cylinder called a plug which is prevented from rotating against the fixed outer part called hull because the pins don't line up inside. As the key is inserted, individual spring loaded pins are pushed up until the gap between the key pin and the driver pin reaches the sheer line. Now, the plug can rotate, voila!

For a diagram explaining how this works: http://goo.gl/IxZou
Video source: Animated: How locks works!

H/T to +Art Jonak for the find.

#ScienceSunday #SciSunRR  
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Have him in circles
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