First, the puzzle that never dies....
The Monty Hall problem covered yet again, this time in Scientific American:
http://www.scientificamerican.com/blog/post.cfm?id=lets-make-a-deal-revisiting-the-mon-2011-04-15
... and (unrelatedly) this great old piece on "Kaprekar's operation" (or Kaprekar's number "6174") from plus.maths.org:
http://plus.maths.org/content/os/issue38/features/nishiyama/index
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