Gravar-mail: Editorial Comment on: The Impact of Dust and Confinement on Fragmentation of Kidney Stones by Shockwave Lithotripsy in Tissue Phantoms by Randad et al. (From: Randad A, Ahn J, Bailey MR, et al. J Endourol 2019;33:400–406; DOI: 10.1089/end.2018.0516)