Yes, I have read slaughter house five.

The aliens and the notion of how the universe ends was really disappointing.
Time, and cause/effect do not work that way. It could work if, at that moment the scientist tested that fuel, that everyone was done with the universe.

We are trained at a very young age that cause/effect are all physical, deterministic happenings. In a chain from the past to the future.

But, take this into account.
There was a doctor who did open brain surgery. He found the spot in the brain, stimulated made the impression of pricking the finger.

Now, "modern science" would have you think that the prick of the finger, enters the nerves, then travels up to the brain to tell you that the finger was pricked. And that if you stimulated the area of the brain, it would be instantaneous, because there was no distance to travel.

However, what he found was the opposite.
When you pricked the finger, the person felt it instantly.
When you stimulated the brain, it took a bit before the person felt it.

So, according to linear science. Prick the finger, causes a signal that goes back in time so that it arrives at the brain at the moment of the pricking. (this is not what happens, but gives you an idea of what causal effect loops aren't in the direction we think.)

All healing comes from your future self.