A surprising industry has emerged in Boise, Idaho: Women are becoming paid reproductive surrogates for people from around the world. Here, four women share their experiences as they build relationships with intended parents, prepare for the rigors of pregnancy, and navigate the mixed feelings of their own families, who struggle to understand the surrogates' choice to risk the physical and emotional complications of carrying babies for another family.

Why the Bronx burned in the 1970s. Included: archival and home movie footage; and insights from retired FDNY firefighters, Bronx historians and community organizers.

More than 50,000 local interpreters helped protect U.S. troops in Iraq and Afghanistan, enabling soldiers to communicate with the local population. But those who took the job were often considered traitors. In the aftermath of war, some have been able to leave their home countries and reach safety, while others still languish in hiding and fear for their lives.

How the onslaught of development in Long Island's wealthy Hamptons has triggered a clash of values. Members of the Shinnecock Indian Nation, farmers and fishing communities seek to stop the building boom and preserve the environment.

The true story of Alaska Native dogsled champion George Attla is presented. With one good leg and fierce determination, he rose to international fame. His racing prowess and ability to identify and train exceptional dogs made him a legend.

Yusuf Abdurahman, who left Somalia as a refugee 25 years ago, has his worst fear realized when his son is arrested in an FBI counterterrorism sting. Follow Yusuf as he strives to understand why his child would leave America and attempt to join ISIS.

The Rainbow Coalition story is told with archival footage and interviews with former members.

Despite successful careers, educated women face the stigma of being unmarried in China.

The story of a heatwave that overtook Chicago in July 1995, killing 739 residents, most of them poor, elderly and African American. The heatwave revealed a long-term crisis of poverty, racism, and economic and social isolation in the city.

The building of a $120 million Noah's Ark exhibit is featured, backed by the Creation Museum in Williamstown, Kentucky. It was designed to prove the Bible is historically and scientifically accurate. Residents who support and oppose it are heard from.