Hart Island is America’s largest public cemetery—sometimes known as a “potter’s field.” The island has no headstones or plaques, just numbered markers. More than a million people are buried on Hart Island in mass graves, there are no headstones or plaques, just numbered markers. In this special, hour-long episode we're untangling mysteries about how people ended up on Hart Island, the lives they lived and the people they left behind.

When it comes to the space race, we all know names like Neil Armstrong and Yuri Gagarin. But in most moments in history, there are a few names that fall through the cracks. One of those names was Ed Dwight.

When Ed was selected to train to become an astronaut, many thought he would become the first Black man to go to space — but Ed faced some unexpected hurdles. Today on the show, we bring you that story — and a surprising update on Ed's 63-year-wait to go to space.

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Humanity isn't great at eradicating diseases. But there is one disease that humanity has managed to eradicate: smallpox.

Smallpox was around for more than 3,000 years and killed at least 300 million people in the 20th century. Then, by 1980, it was gone.

Rahima Banu was the last person in the world to have the deadliest form of smallpox. In 1975, Banu was a toddler growing up in a remote village in Bangladesh when she developed the telltale bumpy rash. Soon, public health workers from around the world showed up at her home to try to keep the virus from spreading. This is her story.