Hello and first of all I would like to say that I appreciate your work here since I am new to this forum. So here it goes. I was wondering for a long time. Someone travels back in time somehow and let's say he goes 1000 years back. He knows the future and he makes an action to change it. Our world and our present will not be affected right? So when he traveled back in time he went to an alternate time line? Did he create that time line or dimension? Or our world will really be affected? And what about those paradoxes? I would really appreciate an educated answer. Thanks a lot!!