After 40 years of AIDS, progress made but problems remain

Four decades ago this past week, the first ever cases of the HIV/AIDS epidemic were publicly noted, and hardly noticed. But soon after, cases exploded around the world. It's estimated that roughly 35 million people have died from AIDS in the years since. William Brangham reports and speaks with two people deeply immersed in the issue for a look back at the epidemic and the best way forward.