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Science 6 July 2007:
Vol. 317. no. 5834, pp. 49 - 50
DOI: 10.1126/science.1145113
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Perspectives

MATERIALS SCIENCE:
Shape Matters

Martin van Hecke

When nonspherical granular systems form swarms, density is no longer well defined.

The author is in the Kamerlingh Onnes Laboratory, Leiden University, 2300 RA, Leiden, Netherlands. E-mail: mvhecke{at}physics.leidenuniv.nl

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Science. ISSN 0036-8075 (print), 1095-9203 (online)