President Carter helped lead a global health effort to eradicate the Guinea worm, a painful parasite which once infected more than 3 million people a year. Cases now number about a dozen a year.
On this week's "My Unsung Hero" from Hidden Brain, Mark Metersky was a medical student at a New York City hospital. He was frustrated with one of his patients when he saw something that surprised him.
The day after the worst plane crash by a South Korean airline on Korean soil, the focus turned to returning victims' bodies to their families and investigating the cause of the crash.