by 
KevinW42
ANSWERS: 3
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100%, if you look long enough. To speed things up, you might take a big magnet and pick up all the needles with it. If you do it right the piece of hay should filter out and there you go.
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Suprisingly good if done with the right planning! Mythbusters video: http://video.google.com/videoplay?docid=-4415313083196714200
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Well the mathematics of this will depend upon the size of the needle, the size of the haystack and the time you have to perform the function...
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