LHC scientists find family of new particles
Scientists working on the Large Hadron Collider (LHC) have discovered new 'exotic' particles that seem to be "tetraquarks". Quarks are the fundamental constituents of matter that combine to form proton-like particles. Until recently, it was believed that quarks only come in groups of two or three, but in 2014, a tetraquark was discovered while a pentaquark was found last year.