Have students interview other students to mine the collective knowledge of the group.
Students form pairs and one-partner interviews the other on a predetermined topic (What are some of the most significant health issues facing humankind today?) for two or three minutes; partners switch roles. Then pairs combine to form groups of four. Each group member introduces his or her partner, sharing the information from the original interview. This is a great icebreaker activity and also fosters active listening. (Source)