1. Aaron Carrol breaks down why US healthcare is so expensive in excruciating detail.
2. Mao was a really, really bad person.
3. What was the hipster?
4. The reason why no voting system can be perfectly fair in all ways: Arrow's impossibility theorem.
5. More on the ethics of voting.
6. Best books of 2010 from Publisher's Weekly.
7. What will happen to Lake Powell?