Scientists have proposed an updated model of particle physics that predicts the decay of the Higgs Boson into the mysterious dark matter particles that make up a quarter of the universe.
The standard model of particle physics has been an amazingly successful at not only describing the particles and forces of nature but also predicting new particles that were later found. This is the hallmark of a theory that is clearly onto something. Cobbling an idea together to describe phenomena already known is one thing, but actually making predictions that are later verified means that your theory is, at some level, a worthwhile model of reality (or it is otherwise incredibly lucky). The final major particle predicted by the standard model was the Higgs Boson and its discovery in 2012 capped an amazing journey that started way back in the 1970s.