I find the coverage of this drive simply bizarre. There is nothing impossible about it, in principle.<p>We know E=mc^2 (mass and energy are equivalent).<p>We know that rockets move by ejecting mass at high speed in a direction counter to the desired direction of movement. The rocket shifts forward an equivalent amount (m1v1=m2v2).<p>We know that it is possible to focus EM radiation emissions.<p>So far so good.<p>The "magic" here (used in the sense of sufficiently advanced tech, of course), is that the EM emission is entirely unidirectional.<p>So instead of throwing mass out the nozzle, we're throwing energy. And since E=mc^2, we get the same effect: RmRv=E/c (rocket mass times rocket speed equals Energy over c (since m2v2 = (E/c^2)c).<p>Very, very, very cool.