Gizmodo posted an article discussing what to know about the newly discovered Tetraquark at the Large Hadron Collider.
Quarks are the building blocks of all matter; they’re subatomic particles that combine to form hadrons, the group that includes the familiar protons and neutrons. (In other words, quarks are smaller than small.) Protons and neutrons are both made up of three quarks, but the newly discovered hadron particle is made of four, making it a species of tetraquark. The first tetraquark was officially discovered in 2003.
For more, check out this Gizmodo/MSN story.