neutrino

From The Washington Post, July 12, 2018: At the IceCube experiment at Earth’s South Pole, 5,160 sensors buried more than a mile beneath the ice detected a single ghostly neutrino as it interacted with an atom. Scientists then traced the particle back to the galaxy that created it.
The cosmic achievement is the first time scientists have detected a high-energy neutrino and been able to pinpoint where it came from.

From Scientific American, June 27, 2018: There are plenty of arguments for why the lesser known Greek letter should be as popular as its more famous cousin, pi. Tau is the name given to one of the charged leptons and its partner neutrino, discovered in 2000 at Fermilab.