In the future there’s time travel & folks can travel back in time, the only issue is they come as new born babies.
The bigger problem is, the memories are time limited. Max 6years, Everyone who comes thinks that they can do it but no one had succeeded in passing the message.

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Quote text and notes from Wikiquote: Ized Uanikhehi (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.