I often find Wikipedia-only links handy to introduce me to topics that I never even knew existed—that is, where, in some sense, "this topic exists" is interesti

I often find Wikipedia-only links handy to introduce me to topics that I never even knew existed—that is, where, in some sense, "this topic exists" is interesting in itself. One particularly memorable one was https://en.wikipedia.org/wiki/199_398_500_A https://en.wikipedia.org/wiki/199_398_500_A (though I can no longer find the HN link to it); it's then easy enough for me to Google around for more context if I care to do so.