It was just a concept to me,till i realised it was actually applied in practicality.Its quite scary to know the depth and hows it works in real world.
Here is a link to demonstrate what it exactly is !!
http://www.youtube.com/watch?v=J9wRq6C2fgo&feature=related
http://www.youtube.com/watch?v=a1HeR-bdNwE&feature=related
you can follow on the link and also watch the related videos for better understanding!
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