Entry-level aerospace engineers usually need a bachelor's degree. High school students interested in studying aerospace engineering should take courses in chemistry, physics, and mathematics, including algebra, trigonometry, and calculus. Bachelor degree programs are designed to take four years and include classroom, laboratory, and field studies in subjects such as general engineering principles, propulsion, stability and control, structures, mechanics, and aerodynamics (which is the study of how air interacts with moving objects). Some colleges and universities offer cooperative programs, in partnership with industry, that give students practical experience while they complete their education. Cooperative programs and internships allow students to get valuable experience and to finance part of their education. At some universities, a student can enroll in a five-year program that leads to both a bachelor’s degree and master’s degree upon completion. A graduate degree will allow an engineer to work as an instructor at a university or to do research and development.