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Extra resources for [Magazine] Scientific American. Vol. 304. No 5

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M. Weiss Cen, Ostriker and Davé dubbed this material the warm-hot mulate into the cool, dense pools required for galaxy formation. intergalactic medium, or WHIM. If we could empirically con- Obviously, though, some of the baryons did manage to turn into firm its presence and extent, we might be able to pin down the galaxies, or else we would not be here. location and condition of the missing baryons. Another thing is clear, too: galaxy formation used to be much The most promising way to detect the WHIM is to look for more efficient.

Michael Tri Hoang Do and King-Wai Yau in Physiological Reviews, Vol. 90, No. 4, pages 1547–1581; October 2010. com 43 © 2011 Scientific American John C. Baez is a mathematical physicist currently based at Singapore’s Center for Quantum Technologies. Previously he explored questions in fundamental physics. D. in mathematics at the University of California, Riverside. His work tackles the foundations of supersymmetry. 44 Scientific American, May 2011 Photograph/Illustration Photographs by Zachary by Artist Zavislak Name © 2011 Scientific American M at h e m at i c s the Strangest Numbers in String Theory A forgotten number system invented in the 19th century may provide the simplest explanation for why our universe could have 10 dimensions By John C.

A radically different technology that relies on magnets could dramatically cut the load. Most commercial coolers compress and decompress a refrigerant gas or liquid through a repeating cycle. As the refrigerant cycles, it draws heat out of the inside of a room or appliance. Compressors are energy hogs, however. And the most commonly used gases, when released, warm the atmosphere at least 1,000 times more than carbon dioxide does, molecule for molecule. Researchers at Astronautics Corporation of America in Milwaukee are developing a cooler based on magnets that eliminate the compressors.

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[Magazine] Scientific American. Vol. 304. No 5

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