SANTA FE, New Mexico, March 13 (TNSres) -- Santa Fe Institute issued the following news release: Tiny particles like pollen grains move constantly, pushed and pulled by environmental forces. To study this motion, physicists use a "random walk" model -- a system in which every step is determined by a random process. Random walks are useful for studying everything from tiny physics to diffusion to financial markets. But what if the environment itself -- and not just the walker -- is random? "We   more