This week on Up Close, a look at the concept of "personal responsibility" from two different angles. University of Pennsylvania classics professor Emily Wilson re-examines the life and ideas of Seneca, the father of Stoicism, in the "The Greatest Empire: A Life of Seneca." And author Johann Hari challenges commonly held notions about how we deal with drugs and addicts in "Chasing the Scream: The First and Last Days of the War on Drugs."