S15 E1: Top Gun and Beyond

S15 E2: How to Create a Junk Food

S15 E3: Buried in Ice

S15 E4: Why Planes Burn

S15 E5: Battles in the War on Cancer: A Wonder Drug on Trial

S15 E6: Battles in the War on Cancer: Turning the Tide

S15 E7: The Mystery of the Master Builders

S15 E8: Whale Rescue

S15 E9: The Man Who Loved Numbers

S15 E10: Race for the Superconductor

S15 E11: Can You Still Get Polio?

S15 E12: Pioneers of Surgery: The Brutal Craft

S15 E13: Pioneers of Surgery: Into the Heart

S15 E14: Pioneers of Surgery: New Organs for Old

S15 E15: Pioneers of Surgery: Beyond the Knife

S15 E16: Can the Vatican Save the Sistine Chapel?

S15 E17: Can the Next President Win the Space Race?

S15 E18: Do Scientists Cheat?

S15 E19: Who Shot President Kennedy?

S15 E20: The Light Stuff

S15 E21: The All-American Bear

S15 E22: Can We Make a Better Doctor?