Dayo, a physicist, sat next to her boyfriend, Jared.

  "Are you ready?" she asked him.

  He nodded.

  "Are you ready?" she asked him

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  He nodded.

  "What just happened?"

  "You experienced Déjà vu, right?"

  "Yes. A time warp?"

  "That was my first theory ..."

  "All right, Dayo, tell me, what causes it?"

  She held up a device.

  "What's it do?" He raised an eyebrow.

  "I don't have enough power, so it only briefly allows us to swap with our doubles from a parallel world. They're asynchronous, so Déjà vu."

  "Dayo, are you saying others are swapping ..."

  She smiled and nodded.