The defense for convicted Boston Marathon bomber Dzhokhar Tsarnaev has been presenting the jury with a social history of his family. Today, in Day 27, the defense turned the focus to their ethnic homeland of Chechnya. Boeri and Cullen discuss how the long history of the Chechen people influenced the psychiatric well-being of Dzhokhar's father, and how his older brother Tamerlan became unhinged and abusive.