Physicists report electron is round—what does that mean?

Artists' conception of the search for an electron dipole.

Last week, or maybe the week before (the days fly by so fast), reporters were all agape with surprise that the electron was round. Very round. I put it on my list of things to write about, took a deep breath, and dived back into the painful process of grading. Grades are now done, and the electron is still round.

What makes a round electron so important? And what do we mean by round anyway?

It’s all about symmetry

The electron is, in most conceptions, a perfect point particle. It has no internal structure—it is simply a point with a negative charge, some angular momentum, and a tiny magnet.

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Read the original at Ars Technica.