I'm not a physicist, but I play one on TV.

Direct Observation of the Nu Tau (DONUT)

The people from DONUT have observed and cataloged the behavior of the tau neutrino, which is the last of the subatomic building blocks of matter. Basically, they used an emulsion to track particle interactions. Over three years, in the course of some six million interactions, guess how many were sitings of the tau neutrinos?

Four. Yes, a whopping four. All the same, it exists, and that in itself is pretty durned exciting. The next problem is to determine whether this particle has mass. Scientists say that the mass of such a particle could be staggering, since the thing is virtually everywhere.

I think it's pretty cool that physics has changed so much since I last studied it.

before - after