[allendoerfer]

It's on "Did you win the Putnam?" or "xkcd 927" level and does not really need a link on HN at this point.

[wffurr]

Now I need to look up "Did you win the Putnam?". It's my lucky day to learn about this.

[danielheath]

https://news.ycombinator.com/item?id=35079

[ljf]

https://xkcd.com/1053/

I can assure you there are plenty of readers here who have not heard of it. I shared the link at work recently and was interested that not a single person knew of it (they are fairly young though).