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.