Question: How many students attend the school that employs Roberto Andorno?

Knowledge 1: Roberto Andorno
Roberto Andorno is Associate Professor at the Faculty of Law, University of Zurich (Switzerland). He is also Research Fellow at the University's Institute of Biomedical Ethics and Medical History. Originally from Argentina, he holds doctoral degrees in law from the Universities of Buenos Aires (1991) and Paris XII (1994), both on topics related to the ethical and legal aspects of assisted reproductive technologies. Between 1999 and 2005 he conducted various research projects relating to global bioethics, human dignity, and human rights at the Laval University (Quebec, Canada), and at the Universities of Göttingen and Tübingen, in Germany. [SEP] Knowledge 2: Switzerland
There are 12 universities in Switzerland, ten of which are maintained at cantonal level and usually offer a range of non-technical subjects. The first university in Switzerland was founded in 1460 in Basel (with a faculty of medicine) and has a tradition of chemical and medical research in Switzerland. The biggest university in Switzerland is the University of Zurich with nearly 25,000 students. The two institutes sponsored by the federal government are the ETHZ in Zürich (founded 1855) and the EPFL in Lausanne (founded 1969 as such, formerly an institute associated with the University of Lausanne) which both have an excellent international reputation.[note 10]
Knowledge 1: Roberto Andorno
Roberto Andorno is Associate Professor at the Faculty of Law, University of Zurich (Switzerland). He is also Research Fellow at the University's Institute of Biomedical Ethics and Medical History. Originally from Argentina, he holds doctoral degrees in law from the Universities of Buenos Aires (1991) and Paris XII (1994), both on topics related to the ethical and legal aspects of assisted reproductive technologies. Between 1999 and 2005 he conducted various research projects relating to global bioethics, human dignity, and human rights at the Laval University (Quebec, Canada), and at the Universities of Göttingen and Tübingen, in Germany. [SEP] Knowledge 2: Boston
The Boston Public Schools enrolls 57,000 students attending 145 schools, including the renowned Boston Latin Academy, John D. O'Bryant School of Math & Science, and Boston Latin School. The Boston Latin School, established 1635, is the oldest public high school in the US; Boston also operates the United States' second oldest public high school, and its oldest public elementary school. The system's students are 40% Hispanic or Latino, 35% Black or African American, 13% White, and 9% Asian. There are private, parochial, and charter schools as well, and approximately 3,300 minority students attend participating suburban schools through the Metropolitan Educational Opportunity Council.
Knowledge 1: Roberto Andorno
Roberto Andorno is Associate Professor at the Faculty of Law, University of Zurich (Switzerland). He is also Research Fellow at the University's Institute of Biomedical Ethics and Medical History. Originally from Argentina, he holds doctoral degrees in law from the Universities of Buenos Aires (1991) and Paris XII (1994), both on topics related to the ethical and legal aspects of assisted reproductive technologies. Between 1999 and 2005 he conducted various research projects relating to global bioethics, human dignity, and human rights at the Laval University (Quebec, Canada), and at the Universities of Göttingen and Tübingen, in Germany. [SEP] Knowledge 2: Brigham Young University
The main campus in Provo, Utah, United States sits on approximately 560 acres (2.3 km2) nestled at the base of the Wasatch Mountains and includes 295 buildings. The buildings feature a wide variety of architectural styles, each building being built in the style of its time. The grass, trees, and flower beds on BYU's campus are impeccably maintained. Furthermore, views of the Wasatch Mountains, (including Mount Timpanogos) can be seen from the campus. BYU's Harold B. Lee Library (also known as "HBLL"), which The Princeton Review ranked as the No. 1 "Great College Library" in 2004, has approximately 8½ million items in its collections, contains 98 miles (158 km) of shelving, and can seat 4,600 people. The Spencer W. Kimball Tower, shortened to SWKT and pronounced Swicket by many students, is home to several of the university's departments and programs and is the tallest building in Provo, Utah. Furthermore, BYU's Marriott Center, used as a basketball arena, can seat over 22,000 and is one of the largest on-campus arenas in the nation. Interestingly absent on the campus of this church owned university is a campus chapel. Notwithstanding, each Sunday LDS Church services for students are conducted on campus, but due to the large number of students attending these services, nearly all of the buildings and possible meeting spaces on campus are utilized (in addition, many students attend services off campus in LDS chapels in the surrounding communities).

Answer: nearly 25,000