Video: Need to Know, June 24, 2011: Combating IEDs, the ramifications of the Wal-Mart case, the science of happy marriages

Summary: We explore the inner workings of a military organization's $17 billion effort to combat IEDs, and Jami Floyd discusses the ramifications of the Supreme Court's decision on the Wal-Mart case. Also: The science of what makes a good marriage.