Hi, I am new to this forum, and I wish I get some help here. I really can't find any solution to this paradox; I am going to deny all the special theory of relativity because of this. The paradox is very simple, here it is: Consider two persons sitting on two adjacent trains at rest. Each person has a timer, and both of them are set to zero. The timers are designed in a way so that when the timer reaches 2 minutes, the other train will explode (and of course damaging the timer inside)! The two trains start moving in opposite directions with same constant speed; the timers start exactly as the trains starts to move. Now here is the paradox: For each person frame of reference, he is at rest, and the other is in motion, then the other timer will run slower, so he will be very happy that his timer will reach 2 minutes first ... destroying the other train. The paradoxical question which of the trains will be destroyed?! Although the whole situation is completely symmetrical, yet each person will assure that his timer will reaches 2 minutes first destroying the other train. Thanks in advance for any ideas.