Current spaceship engine technology works by throwing stuff out the back and letting the equal-and-opposite-reaction push you forward, which has the drawbacks of 1) you have to lift the stuff into space and 2) you will eventually run out of stuff. If someone could figure out a way to obtain forward velocity without losing mass, spacecraft would be lighter, launching them would be cheaper, and satellites would have a longer lifespan. Here's a report suggesting that two scientists in different countries have figured out just such a way, using microwaves and a quirk of relativity. Hopefully it works and isn't just a case of wishful thinking and equipment error.
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