What is time paradox?
I hope this link helps: http://www.exaflop.org/docs/th_sci/paradox.html An example of time paradox: You travel back in time, you kill a great grandfather and end your line, technically you can no longer be born… to that point in time the paradox holds, but, seeing as you have travelled back, you are still here. http://uplink.space.com/showflat.