well, that's what the people do at the stanford linear accelerator. well, it turns out those particles are electrons. the electrons that are shot in your tv tubes, same old electrons. and those electrons are going 99.9999999999999% the speed of light by the time they hit the target at the end, honey, they are going fast. but let me tell you something, that was kinda neat. those electrons in the first couple of feet are going more than 99% the speed of light right there. and they're pushed all the way down. push, push, push, push, push. the copper wires feeding that accelerator are thicker than your wrist. enormous amperage, enormous power. and that is put into driving that accelerator. and that energy takes little tiny part electrons. you know how light they are, my goodness, my goodness? it pushes, pushes, pushes, pushes for 2 miles. and as they push and push and push and doesn't gain much speed. but it gains something else. it gains momentum without gaining much speed. and what's that imply about the mass? that the mass is becoming enormous. when th