Physicists have observed a type of heavy particle for the first time from collisions in the Large Hadron Collider. The Standard Model of physics predicted the particle's existence but until now it eluded physicists.
Why it matters: The particle offers scientists an avenue for studying how fundamental parts of matter interact with one another to form the strong force holding together protons and neutrons in atoms. In other words, what holds everything together.
The details: Xi-cc++ is made up of three quarks (elementary particles that come in six different "flavors" determined by their mass and charge): an "up" quark (the lightest of the bunch) and two heavier ones known as "charm" quarks. The team working on the Large Hadron Collider's beauty (LHCb) experiment detected 300 of the particles in collisions carried out last year.