Lead-lead collisions start at the LHC after 5 years This week the heavy-ion physics season started for the Large Hadron Collider experiments, at the record energy of 6.8 TeV for the first time ever. The ongoing heavy-ion run is expected to bring significant advances in our understanding of quark-gluon plasma, the state of matter believed to have filled the #Universe up to a millionth of a second after the #BigBang. Take a look at the behind-the-scenes in the different control rooms and how physi