AP Top U.S. News At 5:16 p.m. EST   Ethics committee: No punishment for Burris   Couple pleads guilty in Cuban spying case   AP Top U.S. News At 5:10 p.m. EST   US to drop shooting case against Blackwater guard   ADVISORY - Start of KWS news cycle for Nov. 21+   Spokesman says world's largest atom smasher circulates beam of protons after yearlong repairs.   Kyodo news summary-8-+   Kidnapped Britons say Somali pirates may kill them   LEAD: N.Y. stocks slump on lackluster high-tech issues+   Swine flu may have hit one peak; more to come   AP Top U.S. News At 4:52 p.m. EST   Museum: Galileo's fingers, tooth are found   Pa. university students upset about fitness class   US to drop shooting case against Blackwater guard   US says it will drop manslaughter case against former Blackwater guard in 2007 Iraq shooting.   Swine flu may be peaking in U.S.   AP Top U.S. News At 4:24 p.m. EST   Guidelines for cancer screening differ by group   AP Top U.S. News At 4:23 p.m. EST