What keeps sandcastles standing?

@article{HornbakerNature1997, abstract = {Any child playing on the beach knows that the physical properties of wet and dry sand are very different. Wet sand can be used to build sharp-featured sandcastles that would be unstable in dry sand. We have now quantified the effect of adding small quantities of liquid to a granular medium. Nanometre-scale layers of liquid on millimetre-scale grains dramatically increase the repose angle (the steepest stable slope that the substance can form) and allow the development of long-range correlations, or clumps.}, author = {Hornbaker, D. J. and Albert, R. and Albert, I. and Barab\'{a}si, A. L. and Schiffer, P. }, citeulike-article-id = {2294314}, journal = {Nature}, keywords = {granular\_wet, qualifier}, number = {6635}, pages = {765}, posted-at = {2008-01-27 03:41:55}, priority = {2}, title = {What keeps sandcastles standing?}, url = {http://www.nature.com.proxy.library.emory.edu/nature/journal/v387/n6635/abs/387765a0.html;jsessionid=B696EBAD1D5E9625404EE31D788139B1}, volume = {387}, year = {1997} }

TY - JOUR ID - HornbakerNature1997 L3 - citeulike-article-id:2294314 TI - What keeps sandcastles standing? JF - Nature VL - 387 IS - 6635 SP - 765 EP - 765 N2 - Any child playing on the beach knows that the physical properties of wet and dry sand are very different. Wet sand can be used to build sharp-featured sandcastles that would be unstable in dry sand. We have now quantified the effect of adding small quantities of liquid to a granular medium. Nanometre-scale layers of liquid on millimetre-scale grains dramatically increase the repose angle (the steepest stable slope that the substance can form) and allow the development of long-range correlations, or clumps. KW - granular_wet KW - qualifier AU - Hornbaker, DJ AU - Albert, R AU - Albert, I AU - Barabási, AL AU - Schiffer, P PY - 1997/// UR - http://www.nature.com.proxy.library.emory.edu/nature/journal/v387/n6635/abs/387765a0.html;jsessionid=B696EBAD1D5E9625404EE31D788139B1 ER -