The University of California—Irvine, a research institution in Orange County, specializes in areas such as cancer and neuroscience studies in conjunction with the highly ranked UC Irvine Medical Center. Graduate programs are highly regarded at UC—Irvine, too, with specialty offerings at the Paul Merage School of Business and the Henry Samueli School of Engineering. Students can participate in more than 500 student organizations, including nearly 50 fraternities and sororities. The Pacific Ocean is only 5 miles from campus. Known as a commuter school, the university offers on-campus residences. Freshmen are not required to live on campus but more than three-fourths do. The university has earned accolades for its eco-friendly measures, promoting green initiatives through student groups like the Anteaters for Recycling and Conservation.