GENERAL SCIENCE (G S) G S 5500. Independent Study/(1-4).On Demand. G S 5510. Environmental Problems/(3).S. A study of environmental problems: their historical and cultural origins, their scientific background, and their possible solutions. Designed for students with limited science backgrounds. G S 5530-5549. Selected Topics/(1-4).On Demand. G S 5989. Graduate Research/(1-9).F;S. This course is designed to provide access to University facilities for continuing graduate research. It is graded on a S/U basis and does not count toward a degree.