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During a recent kitchen run-in with a fellow brown-bag luncher, he asked whether washing dishes by hand is more or less efficient than using a dishwasher. After a little research, it looks like unless you are able to wash and rinse a dish with less than 4.4 seconds of running water, the dishwasher will always come out on top.

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Greeted by this sign during a recent office tour of the new Cooper Union building at 41 Cooper Square designed by Morphosis, a co-worker asked whether revolving doors really do save energy. Good question.

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