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===Navigational buoys=== ...nically as a replacement for a [[lightvessel]].<ref>{{Cite web|title=Large Navigational Buoys (LNB)|url=http://www.uscg.mil/history/articles/LNB.asp|publisher=Unit ...

...iverse" questions of general relativity must be included. Suppose even the boxes could be reproduced, fit together and closed nicely by curving spacetime. T ...general relativity 100 years ago, he had no idea that it would be used for navigational systems. The consequences of this discovery probably will also have to be r ...