Fabiola Gianotti, CERN's Director general, cuts the ribbon during the inauguration of the new linear accelerator Linac 4, the newest accelerator acquisition since the Large Hadron Collider (LHC), which is due to feed the CERN accelerator complex with particle beams of higher energy, at the European Organization for Nuclear Research (CERN) in Meyrin near Geneva, Switzerland, May 9, 2017. REUTERS/Denis Balibouse