An episode of The Engines of Our Ingenuity explores the history of International Correspondence Schools. The episode, numbered 3404, examines the rise and fall of ICS, also known as The International Correspondence School. Further details about the episode are available from the source.

The episode provides information about the topic, but specifics are not provided here. The episode is part of The Engines of Our Ingenuity series, which covers various topics, and episode 3404 focuses on International Correspondence Schools.