Delve Into the Fascinating World of Dirt Dirt is a matter of opinion, according to public health and hygiene authority Terence McLaughlin. In this engaging, thoroughly-researched, and often humorous study of the "imperfections" of human existence and our relationship to them, McClaughlin dissects human attitudes about the slime, mud, stench and filth which has accompanied society through history. Our notion of cleanliness has a marked cultural aspect. For instance, McLaughlin cites Old Testament examples of cleanliness which, unbeknownst at the time, helped protect observant followers from the plague. The famous baths of ancient Rome were seen as progress for personal hygiene, and later scorned by Christians