The Department of Physics is pleased to announce the best oral and poster presentations by physics graduate students during the Physics Colloquium poster session held on April 19, 2012, in the Aftermath Atrium in Fisher Hall. There were two similarly rated best oral presentations: “Conduction Amongst Mesoscopic Particles” by Douglas Banyai and “Calibrating a Gamma-Ray Observatory” by Nathan Kelley-Hoskins. There were also two similarly rated best poster presentations: “Individual Particle Analysis of Carbonaceous Aerosols Emitted from the Las Conchas Wildfire, Los Alamos, NM” by Swarup China and “Exploring Cloud Microstructure with the HOLODEC I” by Matthew Beals. The presentations were evaluated by the physics graduate students and ranked in order of preference. The winners will receive a small monetary award.