While NASA is having problems reaching milestones for their new Ares rockets--the conventional rocket that will get the US to the moon and Mars--China is actually trying to build a reactionless space thruster like the ones used by Cylon Basestars. Yes, that's science fiction, but the engine is theoretically possible. And I don't know about you, but anything that looks this cool and says "Magnetron" on its plans is good enough for me:

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