Research by Professor Troy Shinbrot and colleagues revealing new mechanisms for the mixing and separation of pharmaceutical and other grains has been covered in The American Institute of Physics Bulletin of Physics News. The work shows how two populations of sand grains mixed together and held in a hopper will, when shaken out into a beaker, spontaneously segregate themselves, because of static electrical interactions. (www.aip.org/pnu/2007/split/832-1.html)