Angel Irizarry is a former detective who worked on missing persons cases. In 2021, he set out on a personal investigation: to find his uncle Cesar, who had been estranged from his family for decades.

A few years ago, a man who called himself Stephen became a fixture in Manhattan's Riverside Park. After his body was discovered, a woman who knew him made it her mission to bring his story to light.

Scientists went to extraordinary lengths to eradicate smallpox from the world. Rahima Banu is now recorded as having the last known naturally-occurring case of the deadly form.

Martha Lillard had just turned 5 years old when polio incapacitated her. She still uses a form of the ventilator that saved her life as a child — though now she worries about replacement parts.

Last spring, Trump froze almost $500 million in funding to three Central American countries to pressure them to stop the flow of migrants. The impact on farmers could end up increasing migration.

The Venezuelan government doesn't want you to know the real value of its currency. But Ruben and Mila figured it out. Now they're on the lam.