“…The articles include experimental, computational, and theoretical studies of granular media in microgravity environments [1], vibration-induced avalanches [2], three-dimensional imaging of grain orientations [3], mechanical [4,5] and vibrational [6] response of granular packings, charge interactions during stick-slip behavior [7], variations of flow fields around obstacles [8], hopper flows [9], and compacted powders [10]. In addition to granular materials, the issue also highlights novel studies of colloidal [11] and granular [12] polymers, slurries [13], and transport of sediment by desert beetles [14]. This collection of topics in soft condensed matter physics mirrors the broad impact of Bob's research over the past 40 years.…”