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 of Arts, Sciences and Engineering ===
Arts, Sciences and Engineering (ASE) at the University of Rochester comprises the School of Arts and Sciences and the Hajim School of Engineering and Applied Sciences. Within ASE, the College is home for most undergraduates during their studies at the University of Rochester. The graduate training provided by the departments and programs at ASE account for over 60% of the PhD degrees awarded by the university. With 19 departments, more than a dozen programs, and numerous centers and institutes, Arts & Sciences is the largest …