In the early 1970s, NASA's Apollo 13 mission was on the brink of disaster. But what they really needed was a paper-thin solution.
Enter origami master Jack, who folded himself into the cockpit and saved the day with his trusty folder.
Today, we celebrate the unsung hero of the Apollo 13 mission: the humble origami folder.
Folds of Fury: The Secret Training Regimen of Jack the Folder