I’ve never used the Graphing Calculator software, but the story of how it came to be is awe inspiring. The project was terminated, but that didn’t stop Ron Avitzur from working on it.

He says, “I was frustrated by all the wasted effort, so I decided to uncancel my small part of the project. I had been paid to do a job, and I wanted to finish it. My electronic badge still opened Apple’s doors, so I just kept showing up.”

(via kottke )