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Physicists have applied the same laser techniques commonly used for tattoo removal to clean several famous works of art, including wall paintings.
 laser cleaning art
UK researchers have developed a device to drag space junk out of orbit. They plan to launch a demonstration of their "CubeSail" next year. It is a small satellite cube that deploys a thin, 25-sq-m plastic sheet...

2010-03-26

 sail space junk cleaning satellite orbit drag debris space junk