Brace yourself for (re)apportionment!

Here’s a concise history of congressional apportionment, with a good stab at explaining the mathematical rules involved.  Tannenbaum’s Excursions in Modern Mathematics devotes a chapter to the topic; I used to teach this in our statistical literacy course.

Tip from The Geek Press

Update (22 July).  A new book on voting systems is reviewed in the New Yorker.