Learning how such memories form could support the design of materials that respond predictably to changes in their surroundings. It may also offer physical models for exploring how different kinds of memory interact, including the relationship between short-term and long-term memories studied in neuroscience. Penn State researchers have now shown that two forms of material memory can exist together in a basic suspension of small particles in a thick liquid. Changes in temperature and vibrations might impart memories in rock that influence risk for earthquakes and sinkholes, for example. Particle encounters may limit memoryThe researchers propose that the memories begin competing when particle encounters become too frequent.