Readers ask about positronium, wild bees and more

cover of September 9, 2020 issue

Dance of the doomed particles Scientists are puzzled by an unexpectedly large gap in the energy levels of an exotic “atom” called positronium, which consists of an electron and a positron, Emily Conover reported in “Positronium result baffles physicists” (SN: 9/12/20, p. 14). Reader Lee Skinner asked why the electron and its antimatter counterpart, the […]