These two sand dunes both "sing" when sand rolls down their sides. But they sing quite differently. For full story behind these dunes, see: http://www.agu.org/news/press/pr_archives/2012/2012-47.shtml
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MIT researchers are developing small magnetic cubes that can communicate with each other to auto-duplicate objects in a “sand box” using a... 
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Glow-in-the-dark sand buried in seaside dunes are time keepers of past storm surges and tsunamis.
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Video of a sandbox equipped with a Kinect 3D camera and a projector to project a real-time colored topographic map with contour lines onto the sand surface. The sandbox lets virtual water flow over the surface using a GPU-based simulation of the Saint-Venant set of shallow water equations.
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Viewed at a magnification of over 250 times real life the grains are shown to be delicate, colourful structures each as unique as a snowflake.
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