Lars Eighner, author of the widely acclaimed memoir on homelessness, “Travels With Lizbeth,” will speak at the University of Colorado at Boulder on Thursday, April 2. Eighner’s address, "A Global Concept of Right and Duty," will begin at 7:30 p.m. in the Old Main Chapel. The talk, which is free and open to the public, is sponsored by the Sewall Symposium Series. Eighner plans to focus on how population pressure affects human rights and responsibilities.