Inside the Large Hadron Collider (LHC), collisions between relatively light oxygen and neon nuclei may be producing matter from the earliest moments of the Universe. Last year, the four LHC experiments also found the first indications that oxygen–oxygen collisions might create it. They lose energy during the journey, an effect known as parton energy loss. The ATLAS Collaboration detected this effect through an imbalance between pairs of particle jets produced in oxygen–oxygen and neon–neon collisions. These particles were more strongly suppressed in neon–neon collisions than in oxygen–oxygen collisions.