Scientists have announced the observation of “CP violation in a D meson” at CERN, a discovery that will appear in physics textbooks for years to come. You’re probably wondering what exactly it means.

The Universe is full of regular matter. There’s also antimatter, which exists even here on Earth, but there’s much less of it. This new observation is important on its own, but it also takes physicists another step closer to explaining where all the antimatter has disappeared to.