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Cover: Brightfield microscopy is used for imaging and quantifying colloid behavior at the pore scale in natural sands. When coupled with Darcy scale breakthrough measurements, this will allow greater understanding of the actual mechanisms governing colloidal and microbial transport in unsaturated sands and soils. This photo shows a partly saturated medium consisting of 1-mm sand grains and 4.8-um hydrophilic colloids. By making the grain surfaces hydrophobic, the hydrophilic colloids will deposit on the grain instead of the air-water-solid interface. See "Pore-Scale Visualization of Colloid Transport and Retention in Partly Saturated Porous Media," p. 444-450, by John T. Crist, John F. McCarthy, Yuniati Zevi, Philippe Baveye, James A. Throop, and Tammo S. Steenhuis.