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Medical historian Richard Barnett traces the history of dentistry in his new book. He says that prior to the 18th century, the profession was often practiced by charlatans with "big muscles."

Elliot Ackerman served five tours in Iraq and Afghanistan, during which time, he says, he witnessed the best and worst that human beings are capable of. Originally broadcast Nov. 11, 2021.

Jones, who died Sept. 9, voiced Darth Vader in Star Wars and Mufasa in The Lion King. He started out in theater in the 1950s, and later won a Tony and an honorary Oscar. Originally broadcast in 1993.

Katori Hall didn't want to gloss over Turner's life in the Tony-nominated musical Tina. Instead, she says, it was important to be "brutally honest" about the pain and trauma Turner has survived.

At the height of his fame, Martin shifted his focus from stand-up to acting and writing. He called his memoir, Born Standing Up, a biography of "someone I used to know." Originally broadcast in 2008.

Journalist James Risen tells the story of Sen. Frank Church, who exposed the dirty laundry of the CIA and the FBI nearly 50 years ago, and inspired congressional oversight of intelligence agencies.

Roach researched animal misbehaviors for her book, Fuzz. She says animals tend to ignore the rules we try to impose on them — and they often have the last laugh. Originally broadcast Sept. 14, 2021.

Historian Jeff Shesol recalls the early days of the space program, when Cold War fears ruled and no one knew if John Glenn would survive America's first orbital flight. Originally broadcast June 2021.

The comic, actor and writer opens up about his name, his family tree and his sexual orientation in an HBO special. "The more honest I am, the freer I am," he says. Originally broadcast April 18, 2022.

In 2018, Delta airlines unveiled new uniforms made of a synthetic-blend fabric. Soon after, flight attendants began to get sick. Alden Wicker explains how toxic chemicals get in clothes in To Dye For.