A short biography and background note on Rosa Parks. Updated 25 May 2013 to note the unveiling of a bronze statue of Parks in the Statuary Hall at the US Capitol on 27 February 2013, and to add a 'More information' link to an article on Parks at Salon.com.

Short biography and background note on Jorge Rafael Videla and the Argentine junta. Updated 19 May 2013 to note Videla's death on 17 May. Videla dies in his prison cell. It is reported that he dies quietly in his sleep.

Background notes on United States presidents and their advisers. Updated 15 May 2013 to note the Reagan administration's effort to prevent Chilean dictator Augusto Pinochet from sabotaging a vote that led to his removal from power.

A short biography and background note on Augusto Pinochet. Updated 15 May 2013 to include information about Pinochet's unsuccessful attempt to sabotage the 1988 plebiscite that led to his removal from power.

A short biography and background note on Pol Pot. Updated 12 May 2013 to report the death of Ieng Sary on 14 March 2013 and to note that the secret bombing raids on Vietnamese communist sanctuaries and supply routes inside Cambodia that began in March 1969 were launched without the knowledge of the US Congress.