Why is the math "pi" named so?

Yes, π, that ratio of the circumference of a circle to its diameter ...
That puzzle has now been solved thanks to this puzzle investigator :)

Understanding geek v. dork v. nerd v. dweeb

Source

A creative use of Venn Diagrams :)
Of course, this is not the first time I have blogged about how the internet makes sharing such creative work so easy ...

How did economists get it so wrong?

That is the question Paul Krugman discusses here. Before we get to that, this cartoon, via Mankiw, explains what economists do:




Now, this is change I can believe in :-)