The origin of mass. Or, the pion�s PR problem.

Diagram depicting pion exchange
between a proton and a neutron.
Image souce: Wikipedia.
When the discovery of the Higgs boson was confirmed by CERN, physicists cheered and the world cheered with them. Finally they knew what gave mass to matter, or so the headlines said. Except that most of the mass carried by matter doesn�t come courtesy of the Higgs. Rather, it�s a short-lived particle