Rob2, I agree with everything you've said. When I said, the machine "could not have reacted differently unless it was a different machine or there was a different stimulus", I meant exactly what you've said. If time could be rewound to the point right before this thread began, such that everything in the universe was exactly how it had been before this thread started, and then someone pressed play, I think everything would inevitably be repeated exactly how it had been before. No matter how many times time was rewound, I think it would be impossible for anything to ever change. Just like the coin toss example, if all the variables were the same (wind resistance, trajectory, thrust from the thumb, etc.), then the coin would flip the same way every time. I don’t know...it seems obvious.
If you push a piano off the empire state building, it’s going to crash to the earth every time. Sleazy and others seem to be saying that even if all the conditions are exactly the same, one of those times the piano might float or something. I just don’t get it. What reason would you possibly have to believe that with all of the circumstances exactly the same, the piano might float, the coin might land differently, or Gipper might run the red light?
I barely know anything about physics, but even if things could happen differently and there is some randomness, what does that possibly get you? Certainly not free choice. A partially random machine ≠ a free machine.