In this Tuesday, April 29, 2008 file photo made by Associated Press photographer Anja Niedringhaus, German chancellor Angela Merkel, center, grimaces, as she tours CERN, the European Organization for Nuclear Research, with Rolf Heuer, CERN Director designated, left, and Robert Aymar, Director General CERN, in Geneva, Switzerland. (AP Photo/Anja Niedringhaus, File) ( Obit Anja Niedringhaus Photo Gallery )