Friday, July 17th, 2026 — Today is National Tattoo Day, and today’s stories are all about ideas that left a permanent mark.

In this episode, discover how Willis Carrier’s attempt to solve a printing problem accidentally changed life in hot climates around the world… relive Disneyland’s famously chaotic “Black Sunday,” when almost everything that could go wrong did… and learn how an American astronaut and a Soviet cosmonaut made history by shaking hands in orbit during the Cold War.

Plus, we celebrate the birthday of the incomparable Donald Sutherland, an actor whose remarkable versatility made every role feel like a new person.

Sometimes the ideas that leave the biggest mark on history begin with solving surprisingly ordinary problems.