In the Middle Ages, St. Francis of Assisi listed dirtiness as a sign of holiness...But by the mid 1800s clean was in. The early Greeks and Romans were among the first to build public baths and toilets. One of the biggest Roman baths held three thousand people at once -- and everyone went naked! But when those empires fell, so did the standard for cleanliness. It would be 1,400 years before bathing came back into style.Newbery Honor-wining author Patricia...