Scientists still don’t understand why neutrinos are abnormally light (SN: 2/26/18). The origin of the particle’s mass remains mysterious: While most fundamental particles obtain their masses from interacting with what’s called the Higgs field — as revealed by the discovery of its particle manifestation, the Higgs boson, in 2012 (SN: 7/4/12) — neutrinos may get their masses in a different manner.