Pizer. The system is now in use at over 800 universities and colleges, as well as several secondary and primary schools. Rochester scientists work in diverse areas. For example, physicists developed a technique for etching metal surfaces, such as platinum, titanium, and brass, with powerful lasers, enabling self-cleaning surfaces that repel water droplets and will not rust if tilted at a 4-degree angle; and medical researchers are exploring how brains rid themselves of toxic waste during sleep. Colleges and schools College of Arts, Sciences, and Engineering - Undergraduate and graduate programs in a large number of fields. This is the largest college of the university by both undergraduate and graduate enrollment. The college is divided into two schools: The School of Arts and Sciences and the Hajim School of Engineering and Applied Sciences. The college is primarily on the River Campus. The Eastman School of Music is a music conservatory offering both undergraduate and graduate education in a number of music fields, including composition, theory, and performance. The Margaret Warner Graduate School of Education and Human Development is the university's graduate school of education. It is on the River Campus in LeChase Hall. The School of Medicine and Dentistry is a medical and dental school with both research and clinical programs. The school of dentistry is known as the University of Rochester Eastman Institute for Oral Health. It is in the University of Rochester Medical Center. The School of Nursing is a nursing school. It is also on the campus of the University of Rochester Medical Center. Simon Business School is the graduate business school. It is on the River Campus. Student life UR's official symbol is the seal of the university, which features a book, representing arts and sciences, a lyre symbolizing music, and a modified symbol of medicine. The official flower of the university is the dandelion, purportedly prolific on the cow pasture that became the university's second campus. The official mascot of the university is a predatory wasp found throughout Rochester, the Yellowjacket. From 1983 to 2008, the yellowjacket mascot was named "URBee." However, when the university re-designed the mascot during the 2007–2008 academic year, a new name was chosen. As of February 1, 2008, the school's mascot is now known as "Rocky". The university uses Dandelion Yellow and Rochester Blue as its official colors, which are the prominent colors on the official regalia. The motto of