XScreenSaver for Android is... a set of screen savers and live wallpapers. That's it. It draws pretty pictures on your screen. And it's free. That's the whole deal.

But in their wisdom, Google -- the most rapacious privacy violator on the planet -- have decreed that XScreenSaver cannot be made available on their "Play" [sic] store until I publish a "Privacy Policy".

For a screen saver. A privacy policy. For a screen saver.

This pantomime where Google pretends to care about your welfare would be hilarious if it wasn't so sad, but here we are anyway.

Ok, strap in!

Hallucination has been widely recognized to be a significant drawback for large language models (LLMs). There have been many works that attempt to reduce the extent of hallucination. These efforts have mostly been empirical so far, which cannot answer the fundamental question whether it can be completely eliminated. In this paper, we formalize the problem and show that it is impossible to eliminate hallucination in LLMs.