Jennifer was explaining her quantum destabilizer invention to her grandson, Eric.

  “That’s fascinating, Grandma! I proudly tell my friends you won a Nobel Prize!”

  Jennifer blushed shyly. “With it, I solved the greatest paradox of ‘all time’ —pun intended.”

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  “What’s that?”

  “Do you remember your grandfather?”

  “Yes,” Eric frowned, “before he passed away.”

  “He wasn’t your grandfather always.”

  “Huh?”

  “You’ll build yourself a time machine—based on my quantum destabilizer.“

  “Oh? Why?”

  “You’ll try testing the grandfather paradox with it someday.”

  “But I would never …”

  “It’s okay. It doesn’t matter. I’ll meet someone else. You underestimated the ‘grandmother paradox.’”