Wired  tells us, that the Hawaii Department of Education is switching to new, energy efficient classrooms because of high local power tariffs.

The new energy positive classrooms are “1,000-square-foot classroom projected to produce four times the energy it consumes—the result of eliminating the need for both artificial lighting and air conditioning.

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Most interestingly, its slating, jagged roof design is derived from the design of factories of more than a century ago.

Read more about it at Wired.com

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