Yuka Takao is from Japan, but currently living in Australia. She says she still uses long division to control her own emotions. "I felt the sense of unity among those who felt anger and the fact that I was able to feel anger"
What does social media do to our self-esteem? How is envy affecting our politics? And should you go to your high school reunion?
Take the Seven Deadly Sins survey: freakonomics.com/nsq-sins/