Physicists want to ramp up their efforts to weigh neutrinos, which are perhaps the most mysterious of all elementary particles. Currently, only one experiment in the world has a shot at making such a measurement — the massive, Zeppelin-shaped Karlsruhe Tritium Neutrino (KATRIN) detector in Germany. But researchers at a handful of other laboratories have been developing alternative approaches, and this week they gathered in Genoa, Italy, to compare notes at a workshop called NuMass 2024. ...