Has the Large Hadron Collider destroyed the world yet tells you just that
So, the other day I wrote about a website that helps you figure out whether or not it's raining somewhere. It turns out that this is a whole category of websites, but I think I just found the most useful "minimalistic information" website yet: It's called Has the Large Hadron Collider destroyed the world yet, and seeks to answer just that question. At the time of writing, the answer is "Nope" – we're still here.
Joking aside, feel free to submit other single-purpose information websites in the comments!