Critical Exponents at the Jamming Transition

T. S. Majmudar, M. Sperl, S. Luding, and R. P. Behringer, Jamming Transition in Granular Systems, Phys. Rev. Lett. 98 058001 (2007).
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Physical Review Letters on 2 February 2007 as Cover Image and Editor's Suggestion
Virtual Journal of Nanoscale Science & Technology on February 12, 2007
Applied Physics: Squeeze Play, Science 315 on 23 February 2007; PDF version with high resolution image of the experiment
New Scientist news service 31 January 2007
Duke University news and communications 3 April 2007