Momentous magnetism. The ability to more accurately measure the magnetic moment of a subatomic particle called the muon reveals a discrepancy of several parts in a billion from the value predicted by current theoretical physics (the “Standard Model”) , and a theory falls. Explaining this requires more than the six quarks, six leptons and twelve bosons of the Standard Model and may require positing a slew of new particles, such as those predicted by an alternate theory called supersymmetry. New Scientist