
What the Author is claiming here is that time-travel is actually invented very often, but that the inventor inevitably “realizes it was a bad idea” and goes back in time to kill his pre-time-machine-inventing self.
There is a graph. On the X axis is sex, on the Y is computer.
What the Author is claiming here is that time-travel is actually invented very often, but that the inventor inevitably “realizes it was a bad idea” and goes back in time to kill his pre-time-machine-inventing self.