But for a piece of furniture that gets a ton of use, not everyone knows how to clean their couch the right way. Carolyn Forté ...

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A new proof reveals the answer to the decades-old “moving sofa” problem. It highlights how even the simplest optimization problems can have counterintuitive answers.

If your living room setup is lacking in that department, Wayfair has the antidote: A highly rated leather sofa is over $1,800 ...