Oleg Roitman and Andrew Vollo

New York City cab driver Oleg Roitman (left), whose nickname is “The Human Computer,” because if someone tells him a date in Russian, Hebrew, or English he can instantly tell them on which day of the week they were born, talks with fellow taxi driver Andrew Vollo (right) about entertaining passengers.

Originally aired September 26, 2008, on NPR’s Morning Edition.