Judith Heumann: Our fight for disability rights -- and why we're not done yet

Four decades ago, Judith Heumann helped to lead a groundbreaking protest called the Section 504 sit-in — in which disabled-rights activists occupied a federal building for almost a month, demanding greater accessibility for all. In this personal, inspiring talk, Heumann tells the stories behind the protest — and reminds us that, 40 years on, there's still work left to do.