In debates about whether or not time travel will ever be possible the argument is often raised that it will probably not since if it would be made possible in the future someone would (have) travel(led) back to our time and we would know about it. This is of course a fair point to make but one that has a number of straightforward counterarguments, two of which are also usually presented:
Someone could have travelled back but not made themselves known, perhaps because they didn’t want to cause such a disruption to the past and thereby the future.
Someone could have travelled back and indeed made themselves known but in doing so been taken for crazy.
There is however also a third and perhaps significantly more likely scenario that I have yet to see anyone present:
Perhaps the moment in human history of which we possess awareness are entirely too…
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