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Light-Speed Spaceships Would Have Trouble Phoning Home
(www.iflscience.com)
This is a most excellent place for technology news and articles.
Logically it makes sense, but the real world is years and often we don't use the right logical systems. It makes logical sense to most people that a heavy object falls faster then a light object ,but we know that is false (and a also a non obvious logical system that also shows it is false)