Dark matter from a new dark strong force: Most of the matter in the Universe seems to be a new form that gives off very little light, called dark matter (DM). While the evidence for DM is very strong, very little is known about what it is made of. As reported in Physical Review D, TRIUMF theorists showed that DM can arise from a new strong force that interacts only very feebly with regular matter. In this realization, DM consists of glueballs consisting of a conglomeration of the mediators of the new force. Implications of glueball dark matter and decays on the formation of light elements in the early Universe, the cosmic microwave background radiation, and astronomical gamma rays seen today were also studied.