Tim S wrote:
Tim S coughed up some electrons that declared:

If you seriously think it increases the mass can you tell us which
subatomic particle it creates and how?
Why would it need to create a particle?

Or, to put it another way, as you are aware, things travelling at relative
speed to an observer's frame of reference gain mass in line with the
Lorentz transformation.

If you go fast enough to double your mass - will there be two of you?


Perish the thought..
meet yourself coming backwards in time..

http://en.wikipedia.org/wiki/Lorentz...Mass_and_speed