<classify> Zimbudzi zidaliponso nthawi yakale ku Eguputo, Persia komanso ku China. Mu nthawi ya chitukuko cha a Roma, zimbudzi mwiso zimapezeka kumbali za nyumba zosambiramo pamene azimbambo komanso azimayi adali pamodzi mosakanikirana.  <topic>: how things work, flush toilets 