Neal Sturchio of the University of Illinois at Chicago reviewed the use of several synchrotron-radiation methods to investigate the structure of interfacial water for various oxide and mineral systems. Sturchio demonstrated the effectiveness of high-resolution X-ray scattering techniques such as grazing-incidence X-ray reflectivity, surface and thin-film diffraction, crystal truncation rods, and X-ray standing waves methods. Results from synchrotron experiments involving interfacial water and quartz, rutile, muscovite, orthoclase, alumina, hematite, and other materials surfaces were presented. The plenary presentation by Michael Tsapatsis of the University of Minnesota reviewed the application of zeolite materials for water treatment. Tsapatsis reviewed the various structures and compositions of crystalline molecular sieve materials, and emphasized their utility in chemical separation, catalysis, chemical sensors, and as nanostructured hosts. The synthesis and characterization methods for these materials were discussed, and selected materials specifically for water treatment were highlighted. The final plenary presentation was given by Tony Haymet of CSIRO Marine Research in Hobart, Tasmania. Haymet emphasized the lack of understanding associated with solutes at interfaces, particularly for processes occurring at hydrophobic surfaces. Haymet reviewed several models of the ice-water interface and compared the thermodynamics of ion solvation in water and in ice. Haymet discussed experiments measuring the Workman-Reynolds effect, which is the electrical potential of liquid relative to ice generated during the freezing of dilute aqueous systems. Several biological applications involving water-ice issues were presented. These included the analysis of antifreeze proteins, associated with some fish species, simulations of the lipid bilayer, and the preservation of sheep cells upon freezing.