Claims coal excavation to have little water flow impact Posted Thu 12 Jun 2003 at 4:01am Thursday 12 Jun 2003 at 4:01am Thu 12 Jun 2003 at 4:01am Help keep family & friends informed by sharing ...

Groups of interacting active particles, insects, or humans can form clusters that hinder the goals of the collective. We find that digging performance can be robustly optimized within the constraints ...