I am told that sleep is something that people do from time to time. I am further told that it is possible to sleep flat, on a structure called a mattress. If sleeping on mattresses is something you do on a regular basis, you might be interested in an amusing reflection on the group theory of mattress flipping.
(Via Ars Mathematica)
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ReplyDeleteThe only time I remember mattress flipping was when my little brother wet the bed, so my parents turned over the mattress. I on the other hand would just buy another mattress!
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