Scientists have announced the observation of “CP violation in a D0 meson” at CERN, a discovery that will appear in physics textbooks for years to come.

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.

There are six kinds of quarks: the up, charm, and top quarks, which all have an electric charge of 2/3, and the down, strange, and bottom quarks, each with a charge of -1/3.

These particles combine into the protons and neutrons that create atoms as well as a variety of other particles, like the D0 meson, a particle composed of a charm quark and an anti-up quark.

The laws of physics do differ if parity alone is switched, but should remain the same if the charge and handedness are switched—this is called CP symmetry, and it basically says that physics behaves the same when you switch a particle with a mirror-image of its antiparticle.

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