At Dallas/Fort Worth Airport, the lights are controlled by sensors that measure sunlight. They dim immediately when it's sunny and brighten when a passing cloud blocks the sun.
At a new middle school in Washington, D.C., the air conditioner shuts off when a window is open.
A wall of windows at a University of Pennsylvania engineering building has built-in blinds adjusted by a computer program that tracks the sun's path.
Buildings are getting smarter - and the next generation of building materials is expected to do even more.
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