New unanticipated particle possibly discovered

[KungKras]

Mr Khan said:

I'm more intrigued by the fact that they might be leaning towards the idea that Electrons can be changed into something with mass (very negligible mass, but still...), though that was something they came up with a few months ago, iirc.

But.... doesn't the electron already have mass, and thus it is something with mass? I remember doing an experiment from which you could calculate how much an individual electron weighs during high school.