Earlier quoted context omitted.
Again, not in the truest mathematical sense of the word, no, but I can reasonably rule it out in most practical senses: a) You look like a human b) You write human language c) We have not seen any direct evidence for any kind of humanoid alien life, but we have seen lots of evidence for humans existing. d) If you were an alien spying on human culture, you wouldn't waste your time on Hacker News :). Does this fully "r…
You can just as safely "rule out" the possibility that these UFOs are aliens.
I just feel like it's extremely reductive to say "can't prove a negative," for which I provided a counter example.