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"Windows, our source of life-giving sunlight indoors, are a menace to your electrical bill. In the summer, windows bleed cold and in the winter they ooze heat. To save energy, researchers want to give window panes a circulatory system that could pump in cool, liquid relief when they get too hot. In research published in Solar Energy Materials and Solar Cells, researchers from Harvard describe an artificial vascular system, which could help make windows more energy-efficient by controlling their temperature with water."
