stubborn problem with time travel is that it is riddled with several types
of paradoxes. For example, there is the paradox of the man with no parents:
What happens when you go back in time and kill your parents before you are
born? If your parents died before you were born, then how could you have
been born to kill them in the first place?
There is also the
paradox of the man with no past. For example, lets say that a young
inventor is trying futilely to build a time machine in his garage. Suddenly,
an elderly man appears from nowhere and gives the youth the secret of
building a time machine. The young man then becomes enormously rich playing
the stock market, race tracks, and sporting events because he knows the
future. Then, as an old man, he decides to make his final trip back to the
past and give the secret of time travel to his youthful self. Where did the
idea of the time machine come from?