Frank, an engineer, showed Marsha, an astrophysics professor and colleague, his time chamber.

  “Have you tried it, Frank?”

  “Not yet; I want you to witness it.”

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  “I won’t witness a thing …”

  “What do you mean, Marsha?”

  “If you attempt to time travel backward, everything rewinds, creating a time loop up to the moment you travel backward again. You'll never know it; we’ll be in an endless hell of a time loop — forever, and ever, and ever — never passing that point.”

  “Nonsense!” Frank said, laughing, stepping into the chamber and flipping the switch.

  Again, and again, and again, Ad Infinitum.