Quote Originally Posted by Dingo View Post
Nice. Lol.

The real question I have, is the old standby whenever a time travel discussion comes up. If you were to go back in time and stop the inventor from creatimg a time machine, what would happen? I've got at least a very basic, layman's grasp of quantum theory, but this one is a stumper.

I think it's interesting that Hawking believes time has physical properties that can be manipulated by gravity. He postulates that different people could genuinely experience time at different speeds, in the right set of circumstances. Gives a whole new take on Einstein's "minute with a pretty girl vs minute on a hot stove" bit. :-)

What if it not a "machine" what if its caused by natural forces?