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Companies, colleges and governments are moving to four-day weeks. Brevard Community College in Cocoa, Fla., went to four days for the 2007 summer session and saved $268,000 in energy costs. There were unforeseen benefits too. Over the year, sick leave fell 50%, and turnover among the 1,500-person staff dropped 44%. "We thought the energy savings would be a plus. But the reaction was about what it meant to people's family lives and their ability to take care of themselves," says college president Jim Drake. Brevard is doing four-day weeks again this summer and may make the change year-round.

— With reporting by Maya Curry