It would take a civilization far more advanced than ours, unbelievably advanced, to begin to manipulate negative energy to create gateways to the past. But if you could obtain large quantities of negative energy—and that's a big “IF”—then you could create a time machine that apparently obeys Einstein's equation and perhaps the laws of quantum theory.
Is it true that man was once perfectly pure and innocent, and that he became degenerate by disobedience? No. The real truth is, and the history of man shows, that he has advanced. Events, like the pendulum of a clock have swung forward and backward, but after all, man, like the hands, has gone steadily on. Man is growing grander. He is not degenerating. Nations and individuals fail and die, and make room for higher forms. The intellectual horizon of the world widens as the centuries pass. Ideals grow grander and purer; the difference between justice and mercy becomes less and less; liberty enlarges, and love intensifies as the years sweep on. The ages of force and fear, of cruelty and wrong, are behind us and the real Eden is beyond. It is said that a desire for knowledge lost us the Eden of the past; but whether that is true or not, it will certainly give us the Eden of the future.
Simplicity is complex. It's never simple to keep things simple. Simple solutions require the most advanced thinking.
The first objection to Darwinism is that it is only a guess and was never anything more. It is called a 'hypothesis,' but the word 'hypothesis,' though euphonious, dignified and high-sounding, is merely a scientific synonym for the old-fashioned word 'guess.' If Darwin had advanced his views as a guess they would not have survived for a year, but they have floated for half a century, buoyed up by the inflated word 'hypothesis.' When it is understood that “hypothesis” means 'guess,' people will inspect it more carefully before accepting it.
There was a seminar for advanced students in Zürich that I was teaching and von Neumann was in the class. I came to a certain theorem, and I said it is not proved and it may be difficult. Von Neumann didn’t say anything but after five minutes he raised his hand. When I called on him he went to the blackboard and proceeded to write down the proof. After that I was afraid of von Neumann.