Is there a site to ask questions that do not fall under any existing site and are of pure curiosity? Ranging from "Why grass is green?" to "How does automatic parking system work?" or could be "why people use gestures when talking by mobile phone?"
Mostly science or technology related but can also be psychology, history, anything... which is just out of pure curiosity.
It would be fun, yet interesting and useful. Or is it against the rules and one should find relevant site to post their question? Which category this new site (if it makes sense) would fall under?