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## Main Question or Discussion Point

"It is impossible to "weigh" a stationary electron, and so all practical measurements must be carried out on moving electrons. The same is true with any other sub-atomic particle. For particles like photons or gluons the situation is even more problematic since the very concept of a stationary or "at rest" massless particle lacks meaning."https://en.wikipedia.org/wiki/Electron_rest_mass

What do you think of this?

What do you think of this?