Fresh Air with Terry Gross

A garment factory that manufactures products for international clothing companies collapsed outside of Dhaka, Bangladesh, last month, killing more than 400 workers and injuring scores of others. It came on the heels of a fire at another factory in November 2012; that incident killed 112 workers.

Factories like these in Bangladesh pump out what author Elizabeth Cline calls "fast fashion," or clothes made on the cheap by big chains such as H&M, Zara, Esprit, Lee, Wrangler, Nike, J.C. Penney and Wal-Mart.

Twenty years ago, when brain imaging made it possible for researchers to study the minds of violent criminals and compare them to the brain imaging of "normal" people, a whole new field of research — neurocriminology — opened up.

Adrian Raine was the first person to conduct a brain imaging study on murderers and has since continued to study the brains of violent criminals and psychopaths. His research has convinced him that while there is a social and environmental element to violent behavior, there's another side of the coin, and that side is biology.