Physicists from the Compact Muon Solenoid (CMS) Collaboration at CERN’s Large Hadron Collider (LHC) have observed three J/ψ particles emerging from a single collision between two protons. The J/ψ meson (J/psi meson or psion) is a flavor-neutral meson about three times more massive than a proton. This particle consists of a charm and an anti-charm [...]