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Continue to ChatIt 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 from https://whatsmyquote.com/quote/it-would-take-a-civilization-far-more-advanced-than-ours-unbelievably-advanced-to-begin-to-manipulate-negative