DuckDuckGo has zero results for Sioux Falls (city of 180k in South Dakota) (duckduckgo.com)

Well I’ll be darned. I thought I found something interesting. Tried it for several minutes, even altering the search somewhat (adding the state, changing capitalization), without getting results, but now it works. I’d delete my submission if I can find out how.

When I posted this there were no results at all. I tried a few approaches, like including the state, capitalizing the city, but it always returned absolutely nothing. All the while, I was getting search suggestions that included the term. Of course, to my embarrassment, immediately after posting to hn it suddenly works.