Life on the Edge

We continue our five-part series on HIV-AIDS by examining how the ethical issues surrounding the virus have and have not changed over the decades—from the ban on gay men donating blood to who should pay for life-saving treatments.

Then, Sebastian Junger and Tim Hetherington talk about the documentary “Restrepo,” which chronicles the deployment of American soldiers to the most dangerous outpost in Afghanistan. And the director of “Gasland” discusses the hazards of natural gas drilling. Plus, a look at the high rate of maternal illness and death around the world—especially in Africa and South Asia.