english: We know, because in the mid-19th century, wonderful Victorian engineers installed systems of sewers and wastewater treatment and the flush toilet, and disease dropped dramatically.
non_english: Znamo, zato što sredinom 19. veka, divni viktorijanski inženjeri ugradili su sisteme kanalizacija i odlaganja prljave vode toalete u kojima se povlači voda i bolest je drastično opala.