My understanding is that electrons are one of the most highly measured entities in science. I'm not sure what the measurement is (mass/charge?) but it's known to maybe 10 significant digits. Furthermore every electron seems to have the same metric, within experimental error. Now, I read many years ago somebody suggested it's because there is only one electron in our reality. It appears here, vanishes, reappears over there, again vanishes, with such rapidity it appears to be many electrons to our instruments. And the reason for the "identical" measurements is simply because its the SAME electron. Does anybody know who first proposed this cute idea?