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Can we travel back in time?

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Says Dr. Neil deGrasse Tyson, “It is possible, the equations allow it, but…

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   “It is possible, the equations allow it, but we don’t know how to make that happen in practice.”¹

   Basic math is pretty straightforward, and plenty of people make their livings cranking out numbers. But mathematics can get fancy with imaginary and irrational numbers in a hurry. People like astrophysicist and cosmologist deGrasse Tyson can put certain things “down on paper,” but that’s as far as they go. Science may act and sound like it has all the answers.

   But not quite–at least so far²…

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   ¹ According to an interview by Michael Rothman on July 3, 2015 on discussing the 30th anniversary of “Back to the Future.”

   ² That’s what scientists typically say or imply.