The relativity principle in connection with the basic Maxwellian equations demands that the mass should be a direct measure of the energy contained in a body...

The relativity principle in connection with the basic Maxwellian equations demands that the mass should be a direct measure of the energy contained in a body; light transfers mass. With radium there should be a noticeable diminution of mass.

quote by Albert Einstein
Submitted by Veronica Serbanoiu
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