I love this story. It’s from way back in the early days of the Google Tech Talks, with low definition video and questionable audio quality. But the content is pure gold. This video tells the clandestine story of how the Mac Graphing Calculator came to be. It shipped on every PowerPC Mac for many years–though it was not an official Apple project–though it was done at Apple–by an ex-Apple employee–who snuck into the building every day. You have to watch it.
My favorite part (among many great parts) is that the Graphing Calculator was the most stable piece of software in the whole system because they did a line-by-line code review as a team. Have you ever written software so thoroughly?