The lay public has been bamboozled by Hollywood's special effects guys and CGI mavens. Even though life comes in amazing varieties, the exigencies of evolving an intelligent tool-user (not twigs to probe for termites--I mean 12mm spanners and MRI machines) mandate an evolutionary model that produces us.
Can't be either proven or disproven conclusively, but I'm amused by how aliens being really different has become such an article of faith that we scoff at all those babe-o-licious green-skinned chicks that always fall for Captain Kirk.
I don't think they all speak colloquial Southern Californian English, like all of Star Trek's aliens did; just that they look like us.
Yet another place where I'm doomed to be Mr. Buzzkill. The Star Wars Cantina is totally bogus.
The real aliens resemble us for the same reason that ichthysaurs, sharks, swordfish and dolphins all resemble each other.
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