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> Surely everyone has already read about this stuff by now?

classic.

Relevant counterargument: http://xkcd.com/1053/

Let me guess – I'm one of today's 10,000?

EDIT: Hell to the hell yeah.

Which means you weren't one of today's 10,000 (when it comes to xkcd)

What do you mean by that?

First of all I'm not even sure this stuff is taught in college outside of a stem degree so I'm sure there are lots of people who have not encountered it.

Even for those who have studied it it's sometimes fun to walk through some light proofs, puzzle things out, refresh your memory.

It also a nice hook to get people interested in math because it one of the areas where you can use creativity to solve problems without needing many prerequisites.

You and I are math students, and we both have this sort of reaction when we see such articles. The important thing is to realize that not everyone is a math student.

We read it so long ago, that we forgot about it.