Extraordinarily claims require extraordinary evidence and reasonably demand healthy skepticism, but HackerNews requires engaging and thoughtful discussion. These threads are constantly full of the same flippantly dismissive remarks, as if it's a novel critique to mention that everyone has a good camera in their pocket these days but hasn't recorded a UFO on it.

HackerNews can be skeptical in interesting, informative ways - the discussion from yesterday of how the superconductor video could have been faked or could be representing something other than a superconductor is a great example. The UFO discussions are usually not that.