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Volume 68, Issue 1, January 2015

cover: Mineral aggregates known as chemical gardens get their name from the plant-like shapes that emerge when a metal salt such as cobalt chloride reacts with a solution containing anions such as silicate. Precipitating walls grow into the spirals, lobes, and other patterns seen in this photograph. Although a chemical garden typically is cultivated in a beaker, the one shown here, about 5 cm across, was grown in the quasi-two-dimensional gap between a pair of transparent plates. To read more about such confined chemical gardens, turn to page 14. (Image courtesy of Florence Haudin, Free University of Brussels—ULB.)

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Scitation: Physics Today - Print edition
http://aip.metastore.ingenta.com/content/aip/magazine/physicstoday/68/1
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