A tiny new experiment at the LHC

The story of the latest experiment approved for installation at the Large Hadron Collider starts with a theorist and a question about dark matter. Jonathan Feng originally described himself as a high-energy-collider guy, specifically a high-energy-collider theorist. Then a well-placed question at a talk started him on a winding path from colliders to cosmology, from theory to experiment, and finally right back to high-energy physics where he began. That path led to today, when the CERN Research ...