As seen on a plaque at Scienceworks.
The penicillin mold was a pest, not a resource. Backteriologists went to great lengths to protect their bacterial cultures against contamination by it. Then in the 1920s, a London doctor, Alexander Fleming, realized that this “pest” was exactly the bacterial killer bacteriologists had been looking for – and the penicillin mold became a valuable resource.
The unexpected. The unexpected success, failure or outside event.