I saw that story earlier on the BBC website and considered submitting it, but thought it wasn't really relevant to HN. Still, now that it's here I can recount

I saw that story earlier on the BBC website and considered submitting it, but thought it wasn't really relevant to HN. Still, now that it's here I can recount a story. I mentioned the headline to a friend who replied: "Who's Buzz Aldrin?" They were serious, so I was wondering - consider the general populace in a Western country. What proportion would you expect to know who Buzz Aldrin is?