Scott at Shtetl-Optimized has started an Unparadox Contest. For example:

**The Banach-Tarski Unparadox:** If you cut an orange into five pieces using a standard knife, then put them back together, the result will have exactly the same volume as the original orange.

(Compare this to the original Banach-Tarski Paradox.) Many more in the comments.

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November 4, 2007 at 9:15 am |

Or how about this variation of The Birthday Paradox:

In a group consisting of one person, the chances are 100% that everyone in the group has the same birthday.

November 4, 2007 at 10:13 am |

I once inadvertently illustrated a variant of the Birthday Unparadox in a math class for childhood education majors: since we had 30 students, I thought it would be fun to see if any pair of them had a common birthday.

What I had overlooked was the fact that this class had a pair of identical twins (sitting in the front row, no less).

D’oh!

November 4, 2007 at 2:36 pm |

Another version of the Birthday Paradox:

In a room with 367 people, the chances are over 50% [in fact, they are 100%] that two people share a birthday.