1. The article discusses how a seemingly innocuous mistake in the formatting of a DOS disk led to the discovery of priceless source code for the original Apple Macintosh operating system. In 1984, a Macintosh developer named Andy Hertzfeld was tasked with creating a diagnostic tool for the new Macintosh computer. He formatted a disk using the DOS file system, which was a common practice at the time, but this inadvertently exposed the hidden Macintosh source code files on the disk.

2. The discovery of this source code was a significant event in the history of personal computing. The code revealed the inner workings of the Macintosh operating system, which was a groundbreaking and innovative piece of software at the time. This allowed developers and enthusiasts to better understand and appreciate the technical achievements of the Macintosh team, and it also sparked further innovation and development in the personal computer industry.

3. The article highlights the importance of understanding and respecting the history of technology. The accidental exposure of the Macintosh source code serves as a reminder that even small, seemingly insignificant events can have far-reaching consequences and can provide valuable insights into the past. The article encourages readers to appreciate the stories and lessons that can be learned from such historical moments in the world of computing and technology.