Well, thank you for your post Tabiya. I agree that local and global evaluation are responsible for some seeming paradoxa.

However I do think that we have to take some things in consideration concerning your example. This is that we have impossibilities. One of these is to attain absolute zero in temperature the other is the impossibility to accelerate to the speed of light. Thus all paradoxa concerned with travel at lightspeed and the behaviour of material at zero temperature can't really count.

Time travle is alos quite interesting, and a lot of brigt minds have thought about it. One result is that we can't alter history, since history made us what we are. Btw the argument that time travel is not possible since we don't meet time travellers seems to be quiet good to me.