If scientists in the future can time-travel, then perhaps they'll go back in time to tinker with genetics thus creating a highly intelligent creature capable of time-travelling and tinkering with genetics. So, perhaps in a secret bunker in America exists highly intelligent humanoid creatures - the result of the tinkering whose future offspring was the cause of their existence, or perhaps us humans are the result of the tinkering without which we'd still be swinging from tree to tree.
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