Tech Tour: An engine with no emissions?

Related: Innovation , Jet engine

1. Innovation
   1. Robot smart enough to clean your room (but not to have excuse to get out of it)
   2. Laser-powered bubblebots have independent streak
   3. Robot sailors leave Hawaii in cross-ocean voyage
   4. Is the end near? Robot programmed to build its own tools
   5. Tiny sensor reads palms, secures your laptop
2. Tech & science
   1. Stuck ketchup problem solved by MIT engineers
   2. Students arrested, expelled for making violent Twitter threats
   3. SpaceX's Dragon catching up to space station
   4. Mars rover catches its own shadow
   5. Yahoo Axis 'search browser' makes surprise debut
3. Related videos & slideshows
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      How to safely destroy computer data
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      Teen suspended for fake Facebook page
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      'Diablo 3' is still diabolically fun
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      SpaceX launches