"The World's Greatest Entertainer" DOUG E. FRESH stops by and talks about celebrating the 50th-anniversary of Hip-Hop and is later joined by DR. OLAJIDE WILLIAMS on their continued efforts for their globally recognized organization Hip Hop Public Health (HHPH.) Award-winning ABC News journalist DEBORAH ROBERTS discusses her new book, "In Lessons Learned and Cherished: The Teacher Who Changed My Life." Then, Tamron meets an amazing teenager who created an app to communicate with his sister, who cannot speak.