Open Days At CERN Particle Physics Lab

MEYRIN, SWITZERLAND - SEPTEMBER 14: A scientist and guide talks to the visitors inside the tunnels at Point 6 of Cern, during the Open Days at the CERN particle physics research facility on September 14, 2019 in Meyrin, Switzerland. The 27km-long Large Hadron Collider is currently shut down for maintenance, which has created an opportunity to offer access to the public. CERN, the European Organization for Nuclear Research, is the world's largest laboratory for research into particle physics. (Photo by Ronald Patrick/Getty Images)