Gammadoodler
Hero
I would refer to near the entirety of the character creation options... which include many..many..many..many..many capabilities for D&D PCs which extend significantly beyond real-world human capabilities and note that D&D humans are not forbidden from attaining these capabilities.since you have no better place to look....
Also, show me where the rules say that this is not a human as we know them, but some magical mutant that only has the name in common
And I'd say again.
One way of explaining it is to say that humans in D&D are biologically/metaphysically/whatever different from D&D humans..
The other is to appropriately(IMO) acknowledge that in fantasy settings real-world human limitations may just not be applicable.