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Faster signaling technologies -- this is a fascinating idea. Can we use gravity to signal? Is not the effect of gravity instantaneous? My daughter and I were discussing this a couple of days ago. She thought gravity 'traveled' at the speed of light, so that earth was not orbiting the sun, but the place where earth was 8 minutes ago was orbiting the sun. Wappy-fun idea, but incorrect. Although it got me thinking about using gravity to communicate. Possible?