Recently the LHCb experiment at CERN discovered a new exotic particle known as a pentaquark. The pentaquark has a long history coming along with it as it actually was conjectured to exist already back in the 1950’s in the original work by Gell-Mann. In the last decades several experiments claimed to have discovered it only to see their initial conclusions being wrong as more data became available. The actual and true discovery had to wait until 2015. The pentaquark is an exotic strongly interacting particle. It is composed of four quarks and an antiquark. The familiar mesons are composed of a quark and antiquark while an ordinary baryon is composed of three quarks. CP3’s Thomas Ryttov was interviewed on this by videnskab.dk. The article can be found here.