<classify> Zvimbudzi zvaivemo zvakare muIjipiti yakudhara, Persia uye China. Mukufambira mberi kweRoma, zvimbudzi dzimwe nguva zvaiva chikamu cheimba dzekugezera dzeveruzhinji umo varume nevakadzi vaive pamwe chete vakasangana seboka.  <topic>: how things work, flush toilets 