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.
Jimmy Carter's one-term presidency saw several foreign policy achievements, but was marked by economic struggles at home and the year-long Iranian hostage crisis.
A Supreme Court ruling eliminated the requirement of sheltering homeless people in some states. Advocates worry the ruling also motivates cities hostile to shelters to get rid of them altogether.
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.