Based on this passage about UCLA, tell me the difference between North Campus and South Campus and which residential areas border the campus.

Context: The new UCLA campus in 1929 had four buildings: Royce Hall and Haines Hall on the north, and Powell Library and Kinsey Hall on the south. The Janss Steps were the original 87-step entrance to the university that lead to the quad of these four buildings. Today, the campus includes 163 buildings across 419 acres in the western part of Los Angeles, north of the Westwood shopping district and just south of Sunset Boulevard. In terms of acreage, it is the second-smallest of the ten UC campuses. The campus is approximately 1 mile east of I-405.

The campus is in the residential area of Westwood and bordered by Bel-Air to the north, Beverly Hills to the east, and Brentwood to the west. The campus is informally divided into North Campus and South Campus, which are both on the eastern half of the university's land. North Campus is the original campus core; its buildings are more traditional in appearance and clad in imported Italian brick. North Campus is home to the arts, humanities, social sciences, law, history, and business programs and is centered around ficus and sycamore-lined Dickson Court, also known as the "Sunken Garden". South Campus is home to the physical sciences, life sciences, engineering, mathematical sciences, health-related fields, and the UCLA Medical Center. The campus includes sculpture gardens, fountains, museums, and a mix of architectural styles.

Ackerman Union, the John Wooden Center, the Arthur Ashe Health and Wellness Center, the Student Activities Center, Kerckhoff Hall, the J.D. Morgan Center, the James West Alumni Center, and Pauley Pavilion stand at the center of the campus, bordering Wilson Plaza. The campus is bisected by Bruin Walk, a heavily traveled pathway from the residential hill to the main campus. At the intersection of Bruin Walk and Westwood Plaza is Bruin Plaza, featuring an outdoor performing arts stage and a bronze statue of the Bruin bear.

During the 2028 Summer Olympics, wrestling and judo will be held at Pauley Pavilion. The campus will also be the location of the Olympic Village for the Olympic and Paralympic Games.

In September 2022 UCLA purchased the Palos Verdes campus of Marymount California University, which had closed its doors that August, after fifty years of classes; the PV campus joins two other locations, in downtown LA, and in Culver City as satellites of the Westwood campus. A faculty and administration task force will review possible applications of the PV campus for UCLA. The Channel Islands will again be visible from a UCLA campus.

Answer: At UCLA, North Campus hosts the arts, humanities, social sciences, law, history, and business programs, while South Campus is home to the physical sciences, life sciences, engineering, mathematical sciences, health-related fields, and the UCLA Medical Center. The UCLA Campus is bordered by Bel Air, Brentwood, and Beverly Hills.