I wonder how many times this has already been posted to HN. Not that I'm complaining: every time I re-read it, I'm charmed and delighted all over again.
I suspect that the link: operator doesn't work well (or at all) anymore, and that those results are only getting returned because the comments contain all the words in the URL (because someone invariably links to the FAQ). Other searches (to articles linked from http://news.ycombinator.com/best) come up empty:
Define the default symbol for the imaginary unit, that is, the square root of negative one. The default Unicode codepoint for the imaginary unit. (DOUBLE-STRUCK ITALIC SMALL I)
\u2148 := <<IMAGINARY_UNIT>>
Also used for the imaginary unit (especially by electrical engineers, who use "i" to indicate current. (DOUBLE-STRUCK ITALIC SMALL J)
\u2149 := <<IMAGINARY_UNIT>>
Redefine the letter "i" to also be the imaginary unit
i := \u2148
Hm, is there an archive of old versions of units.dat anywhere? Occasionally units get deleted from it - I used to keep old versions but I'd forgotten about this some time ago and haven't done so in a while. (Also that was several hard drive crashes ago so I no longer have the copies I made.)
On the kilogram: "I dislike having a prefixed unit as the base reference. What a horrible decision. Why don't you just have it go to ten and make ten a little louder?"
Having been involved in "rationalizing" a systems of hundreds of emails servers dotted round the world down to something manageable I can honestly say that nothing about the weird and wonderful ways that email can fail surprises me any more.
It's good ol' chestnuts like this that made me think of the "rerun" button: http://bit.ly/ek6kqi
Instead of upvoting you would click the rerun link to signal the content as duplicate (but worthy). This would move it out of the news and to a dedicated classics page of timelessly good content.