A Subway store manager wanted to invent a great new sub sandwich recipe – one that would make customers sing for joy and become regular patrons.

After considerable thought, he concocted an ingenious invention – a system for discovering a great recipe. Here’s how he did it.

I have worked for several years as an engineer, making gadgets of various sorts. For years I’ve sat in front of my computer, studied diagrams, scribbled notes, attended meetings, and worked with a team of sometimes dozens of people, to produce something that will be useful to people. The end result is usually satisfying, and we know we have worked well to design something good. Someone looking at our work probably would not appreciate everything that we did to make it work. But they would know that humans created it.