In this simulation we can see particles that are evolving on their own inside this program. You can interact with them with your hands, the one on the left pushes the particles away and the one on the right attracts them.
As amazing as the photos from Mars rovers have been, their vision is rather limited for navigation. NASA Ames and the Jet Propulsion Lab are working on a helicopter that could scout ahead, helping the rovers navigate unpredictable terrain. No more rolling all the way to a cliff edge just to turn around.