Garbology is the study of modern refuse and trash as well as the use of trash cans, compactors and various types of trash can liners. As an academic discipline it was pioneered at the University of Arizona and long directed by William Rathje. The project started in 1973, originating from an idea of two students for a class project. It is a major source of information on the nature and changing patterns in modern refuse, and thereby, human society. Industries wishing to demonstrate that discards originating with their products are (or are not) important in the trash stream are avid followers of this research, as are municipalities wishing to learn whether some parts of the trash they collect has any salable value. The studies of garbology and archaeology often overlap, because fossilized or otherwise time-modified trash preserved in middens is quite often the only remnant of ancient populations that can be found. For those who did not leave buildings, writing, tombs, trade goods, or pottery, refuse and trash are likely to be the only possible sources of information. In addition, ancient garbage sometimes contains information available in no other way, such as food remains, pollen traces of then local plants, and broken tools. Garbology is also used as an overtechnical term for waste management, with refuse workers called garbologists, first seen in Australia in the 1960s. History University of Arizona A. J. Weberman invented the word garbology in 1971 when he went through Bob Dylan's trash. William Rathje's start of his ecologically oriented garbology excavations began in 1987. Rathje was hoping to find more information regarding what the landfills contained as well as to examine how garbage reacts in its environment. During the time that Rathje was starting his projects many misconceptions began and the nation became more conscious of what they were throwing away. Many Americans started thinking the landfills were filled with their "most commonly used items"; fast food containers, disposable diapers, and Styrofoam. Rathje thinks this assumption derives from the fact that these items are often the most colorful and easy to spot. The industrial trash was not correctly accounted for before Rathje's project. According to charts before Rathje the amount of building material in the land fills was zero. He started by surveying different areas of the country to better understand what types of garbage survives under different climates. He found there was little difference between