E-Mail IMAGE: Engineers and physicists from MIT and Georgia Tech are enabling near real-time modeling of wheels, treads, and desert animals traveling at high speeds across sandy terrains. "Dynamic Resistive Force Theory, "... view more Credit: Photo by Jack Delulio on Unsplash Granular materials, such as sand and gravel, are an interesting class of materials. They can display solid, liquid, and gas-like properties, depending on the scenario. But things can get complicated in cases of high-speed vehicle locomotion, which cause these materials to enter a "triple-phase" nature, acting like all three fundamental phases of matter at the same time. As reported in the April 23, 2021 issue of the journal