Um, no. An experiment showing that antimatter does not have negative mass should surprise exactly no one. I suppose that, as long as the experiment had not ac

Um, no. An experiment showing that antimatter does not have negative mass should surprise exactly no one. I suppose that, as long as the experiment had not actually been done, it could be claimed that there was, in principle, some doubt; but there can seldom, if ever, have been an experiment with higher confidence in the outcome. "Practice" working with antimatter has value of its own; did this experiment break any new ground in that area?