Terry Gross

At 98, Carter is the oldest living president in U.S. history. After serving his term, he worked to promote safe housing, human rights and conflict resolution. Originally broadcast in '93, '95 and '96.

Watson, who died in 2012, was born in North Carolina went on to become widely regarded as the single greatest flat-picking guitar player in America. Originally broadcast in 1988 and 1989.

Journalist Will Sommer went to road shows and spoke to believers and their families while investigating QAnon. His book, Trust the Plan, makes the case that there are more conspiracy theories to come.