New discovery in subatomic physics

This is a bit exotic but I have nothing else bookmarked for this month. The first pentaquark has been reported. This is a particle composed of five quarks - very strange but predicted. Normal particles such as protons are composed of three (see diagram) so it is like one and two-thirds of a proton - kind of.

Here is a good article explaining this starting from Rutherford's discovery of the compact nucleus of the atom over a hundred years ago.