After his recent visit to the ALICE experiment Joe Hanson, science writer, biologist, video producer, educator, and the creator and host of "Be Smart" talks about the quark–gluon plasma with the highest temperature achieved in lead-ion collisions at the CERN Large Hadron Collider. Kai Schweda, ALICE Deputy Spokesperson, guides him through the experiment and the physics behind! Thanks also to Fabrizio Grosa and Maximiliano Puccio for participating!