<prompt> Qedela umusho olandelayo: Phakathi nobhadane lwango - 1853-54, uFarr waqoqa ubufakazi obengeziwe bezibalo. Phakathi nesifundo esihlosiwe  <response>: Ukuqubuka kwekholera ngo-1854 eBroad Street, udokotela uJohn Snow wasebenzisa imininingwane eyanikezwa i-GRO 