I suppose every world probably has its secrets, so who is to say?
Yes and no? It depends on who you ask, honestly. In the eyes of some, we're never quite enough of either half--for myself it's human and elf, though that's not always the case. The elves that I spent the latter half of my childhood around were real dicks about it, but I've met plenty of other elves, and humans too, that couldn't give a shit.