this post was submitted on 23 Aug 2024
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xkcd

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Many a hungry time traveler has Googled 'trilobites shellfish allergy' only to find their carrier had no coverage in the Ordovician.

https://explainxkcd.com/2976/

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[โ€“] [email protected] 3 points 1 month ago* (last edited 1 month ago)

Since a time machine has to fiddle with space-time somehow and that is an attribute of the universe โ€“ i agree, the universe is the frame of reference.