  We propose a mechanical granular graphene obtained by replacing the carbon
atoms with macroscopic spherical stainless steel beads in contact. The
experimental measured dispersion relation is presented, in conjunction with
evidence of the Dirac points. In addition, wave propagation along the zigzag
and a robust turning effect of edge waves from the zigzag to the armchair
boundary is experimentally revealed, even in the absence of a full band gap for
bulk modes. Our work shows that mechanical granular graphene can serve as an
excellent experimental platform to study novel Dirac, topological and nonlinear
wave phenomena.
