It would take a civilization far more advanced than ours,...

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.

Michio Kaku Quote About Past, Law, Civilization: It Would Take A Civilization...

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