As a first stop in a journey from Italy’s Gran Sasso National Laboratory to Fermilab, the ICARUS detector is at CERN for an upgrade. Once it reaches its new home, the 760-ton detector will be used to determine whether sterile neutrinos exist. The relocation will also help strengthen the international collaboration needed to realize the US’s much larger neutrino ambition, a 40-kiloton detector in South Dakota’s Sanford Underground Research Facility.

The move dovetails with the particle-physics strategies on both sides of the Atlantic. In June 2014 CERN announced that, in focusing on the Large Hadron Collider and high-energy physics, it would mothball its neutrino beams. And in its most recent Particle Physics Project Prioritization Panel exercise, the US community put a world-leading program in neutrinos as a top aim (see Physics Today, July 2014, page 18). At a White House ceremony on 7 May, officials from NSF and...

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