A CERN breakthrough may reveal why anything exists. In a landmark discovery at CERN’s Large Hadron Collider, physicists have detected subtle asymmetries in the decay of matter and antimatter. For the first time, CP violation—an imbalance in the behavior of particles and antiparticles—has been observed in baryons, the building blocks of protons, neutrons, and essentially all visible matter in the universe. This finding addresses a profound cosmic mystery: the Big Bang should have produced equal amounts of matter and antimatter, which annihilate upon contact. In theory, they should have obliterated each other, leaving only energy behind. Yet the universe exists, filled with stars, planets, and life—evidence that a minute surplus of matter escaped annihilation. Scientists have hunted for the mechanism behind this asymmetry for decades. CP violation was previously observed in mesons, but baryons dominate the material world, making this new result far more significant. By analyzing 80,000 decays of the lambda-beauty baryon (Λ_b), researchers found that its antimatter counterpart decays at a slightly different rate—by roughly 2.5%. The result is robust, with a statistical significance of 5.2 sigma, meaning a less than 1-in-10-million chance of being a fluke. The Standard Model predicts some CP violation, but far too little to account for the matter-dominated universe we observe. While this breakthrough doesn’t resolve the puzzle, it strongly suggests physics beyond the Standard Model—potentially pointing the way to the forces that allowed matter to prevail. ["Observation of charge–parity symmetry breaking in baryon decays." Nature, 2025]