Two presentations are open to the public during the Teaching, Learning and Sociocultural Studies Graduate Student Colloquy on Thursday, Feb. 21; free. Okhee Lee presents "Diversity and Equity in Science Education" from 1 to 2:30 p.m. at the UA Bookstores at the Student Union Memorial Center, 1209 E. University Blvd. Jan Hill presents "Spanish as a Resource, but for Whom?" from 5:45 to 7:15 p.m., in the Kiva Auditorium at the College of Education, 1430 E. Second Street. Email tlscolloquy@gmail.com for more information.