Physics beyond the Standard Model

Imagine you're trying to understand why a perfectly balanced scale tips in one direction when you add a mysterious object. This object doesn't weigh anything on the scale, but it's still causing an imbalance.

In particle physics, CPT symmetry is like the mysterious object. It's a rule that says particles and their antiparticles should behave the same way, even if they're moving at different speeds or directions. If this rule is broken, it suggests there's something fundamental missing in our understanding of the universe.