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Orchestrate Illusions (Superpermuter)

The Minimal Superpermutation Problem - Imagine that there is a TV series that you want to watch. The series consists of n episodes, with each episode on a single DVD. Unfortunately, however, the DVDs have become mixed up and the order of the episodes is in no way marked (and furthermore, the episodes of the TV show are not connected by any continuous storyline – there is no way to determine the order of the episodes just from watching them). Suppose that you want to watch the episodes of the TV series, consecutively, in the correct order. The question is: how many episodes must you watch in order to do this? [more inside]
posted by Wolfdog on Aug 10, 2014 - 34 comments

13 more things that dont make sense

13 more things that don't make sense from the New Scientist. The original 13. Previously.
posted by shothotbot on Sep 7, 2009 - 57 comments

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