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"We erect a huge monument that will forever remain standing, and we write the date of completion on it. We put the text: "here, on (date), the very first time travellers ever appeared" on it. Then, theoretically, as soon as the monument is complete, people should show up and prove once and for all that time travel is possible."
BUT WHAT IF you require like a teleporter to go back in time.
We would need a gateway for them to come back
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