U.S. pares back neutrino experiment to beat rival.

The article focuses on the megaproject, two intertwined efforts called the Long-Baseline Neutrino Facility (LBNF) and the Deep Underground Neutrino Experiment (DUNE), which will not be completed to its original specs until the mid-2030s. Topics include comments from physicists involved in the project, a rival in Japan called Hyper-Kamiokande (Hyper-K), and the plan of Hyper-K and DUNE to search for neutrinos from supernova explosions and signs that protons can decay.