PHOTO OPPORTUNITY Carl Tinstman, a 30-year veteran of the United Nations who served in three different U.N. agencies with assignments in Asia, Africa and the Middle East, will speak to University of Colorado at Boulder students on Tuesday, Feb. 7, at 11 a.m. Tinstman will speak during a Smith Hall International Program class addressing regional cultures of Africa, held in the Cristol Chemistry and Biochemistry building room 131.