Bread ‘n’ butter

The best of the rest from the physics arXiv this week:

 Washboard Road: The Dynamics of Granular Ripples Formed by Rolling Wheels 

Sheep Collisions: the Good, the Bad, and the TBI

N-Dimensional Quantum Cellular Automata

Subwavelength imaging of visible light with arrays of metal-coated semiconductor nanoparticles

Coevolution of Mercy and Altruistic Cooperation

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