This issue, we ask “5 Questions” of Greg Voth, associate professor of physics. Q: Professor Voth, what are your primary areas of research and how did you become involved in them? A: My research group studies turbulent fluid flows and flows of granular materials. These complex systems have a wide range of environmental and industrial applications, but fundamental understanding of these systems has been held back because of the difficulty of measuring rapidly changing flow fields. Advances in high speed digital imaging over the past two decades have opened new ways to measure the trajectories of particles transported by these…