But the "too hot and noisy" objection seems less certain now that there's research into quantum "computation" allowing for photosynthesis as well as something else quantum involved in birds' navigation.
It's a bit of a tangent, but I thought the recent stuff about some special "quantum" coherence enabling photosynthesis was mostly hype, as it could happen just the same classically.
[Post redacted 'cuz I unfairly and carelessly misrepresented someone's views (Eliezer's). The messages of this post was: disbelief that aliens visit Earth in spaceships is a bad reason not to look into ufology. My apologies for this ugly post.]