Time travel theories of Albert Einstein, Stephen Hawking, Ken D. Olum, Amos Ori, and Igor D. Novikov all packed into a short article. It's a great read.
"To return to the past, a traveler in a rocket would zip around inside the donut, receding a little further into the past with each orbit, Ori says."
Donuts and time travel. It'd be cool, but could it happen in our lifetime?
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