Hi, I chanced upon https://www.physicsforums.com/showthread.php?t=321935 and read Doc AI's reply basically saying: if 2 bodies moving near speed of light relative to each other, the clocks on the other body will appear slower on either body. And I think this should theoretically mean the slowness is only an effect of observation (as an inability to observe to great accuracaries due to some unknown limitations of observation devices such as the eye etc.) and not in reality happening. Is this correct or wrong? Or has it been experimentally shown that a moving body really has all processes slowed down. e.g. a slowed chemical reaction? I really don't think this is the case because if Doc AI is correct, the people carrying out the experiment are the ones moving with respect to the experiement itself! Or even weirder, is to say that sending one single object to the past/future is relativitiscally equivalent to sending the rest of the universe to the future/past. Perhaps we are already phasing in and out of the 4th dimension without knowing.