9 Active Yoga; for those who need to move; followed by relaxation, some experience preferred; noon-1 p.m., Hutchinson Gym. Also December 11 (Recreation).
10 Gentle Yoga; for relaxation, no experience necessary; noon-1 p.m.; Hutchinson Gym. Also December 17 (Recreation).
Discount Medical Book Sale;11a.m.-6 p.m.; Harrison Room, Penn Tower Hotel. Through December 12 (National Book Exchange).
9 Environmental Impact of Off-Shore Petroleum Exploration and Development; Patrick Cole,Nigeria, International Business and Finance; Barbara Lawrence, Shell International Limited; Michael D. Cochran, Anadarko Petroleum Corp.; Roger Prince, Exxon Research and Engineering; 1-4 p.m., 109 Steinberg Hall-Dietrich Hall (African Studies Center; Institute for Environmental Studies).
12 Envinonmental Characterization Study of South and Southwest Philadelphia: A Progress Report; Thomas Burke, Johns Hopkins University; 12:15-1:45 p.m., 1203 Steinberg Hall-Dietrich Hall (Institute for Environmental Studies).
16 Inorganic Phosphate: Why, Where and How is It Transported?; Hartmut Wohlrab, Boston Biomedical Research Institute; noon; Austrian Auditorium, CRB (Biochemistry and Biophysics).