Scientists working at the Fraunhofer Institute for Building Physics
in Germany, have devised an 'intelligent window' which can automatically modulate the amount of sunlight entering a room.
Just as sunglasses block light,
the window's glass surface has a
coating which is transparent at
cool temperatures but becomes
opaque when the temperature
shoots up to a given level. In addition, the Institute has also developed a method to harness solar
energy by warming the air on the
glass facade of the building.
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