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In 2021, the most precise measurement of the muon’s anomalous magnetic moment and a new high-precision lattice quantum chromodynamics calculation have in turn kindled, then dimmed, hopes for seeing signs of new physics. State-of-the-art calculations, made possible by a series of recent advances, will be key to understanding these conflicting results.
Peoples’ movements are linked with the spread of epidemics — but not always in simple ways. In the past two years, new datasets and analyses have shed fresh light on how to relate mobility and contagion.
