Particle packing and compaction are important in many aspects of materials science and technology, including the flow and storage of slurries and of granular agricultural and fertilizer products; the forming of ceramic components, powder metallurgy (P/M) parts, and pharmaceutical tablets; road and dam construction; landfill and waste-remediation-site design and development; shoreline and earthquake stabilization; predicting and controlling mud slides, rock slides, and avalanches; and mine and oil-well positioning and stability. On the less technical side but perhaps of more practical interest are how packing and compaction produce the “apparently” half-empty packages of cereal and potato chips, and how to make better sand and snow castles. There is a great need for engineers and scientists to understand and control particle packing and powder compaction.