Hi chinglu. Please Register or Log in to view the hidden image! Fair's fair, mate! I already did that for you in my post #758. Please Register or Log in to view the hidden image! Wherein I removed all the extraneous variables-----ie, I gedankenly removed the earth and all other objects/dynamics EXCEPT for the 'minimum essentials' of the twins and their clocks. Did you miss that post #758 from me? If you did, then please read that post/example now BEFORE you waste any more of your valuable time and energy on the trivial 'challenges' and 'claims' in this instance; which have been already clarified by 'multiply redundant' logically and physically consistent VALID answers which definitively and in every way imaginable have successfully refuted your particular assertion there; and also your continuing conflation of the philosophical 'live/exist' DURATION concept with the physical ''age/tick' TIMING process (as also already explained via 'multiple redundancy' efforts). Enough's enough, mate, even for someone as patient and open minded and evenhanded as ME. Why not admit you lost this one and move on to concentrate better on the things you are discussing in the other threads? Save your time and energy for where it will do most good, mate! Please Register or Log in to view the hidden image! OK? Cheers and see you round, mate. Please Register or Log in to view the hidden image!