<prompt> Ramba uchinyora ndima iyi - Chiremba wokuBritain John Snow akashandisa mufananidzo wakafanana nowaVoronoi muna 1854 kuratidza kuti ruzhinji rwevanhu vakafa mukubudirira kwecholera muBroad Street  <response>: aigara pedyo nepombi yemvura yeBroad Street yakanga yabatwa neutachiona kupfuura imwe pombi yemvura ipi neipi. 