Synopsis

From Tunisia, Bob Simon reports on protests that overthrew the country’s authoritarian leader and ignited a wave of unrest in Egypt, ultimately leading to President Hosni Mubarak’s resignation. Lesley Stahl examines the newly recognized condition of "superior autobiographical memory"—the remarkable capacity to recall nearly every day of one's life. Stahl speaks with a small number of people known to possess this extraordinary ability, a phenomenon that scientists are only now beginning to und