Colleges and universities display substantial differences in the ratio of students to faculty across fields or disciplines. At Harvard University, for example, economics has about 16 students majoring in the subject per full-time-teaching equivalent, while in other departments such as astronomy,...

Immigration policy is one of the most contentious public policy issues in the United States today. High-skilled immigrants represent an increasing share of the U.S. workforce, particularly in science and engineering fields. These immigrants affect economic growth, patterns of trade, education...