Katherine Boyle just named Elon Musk's greatest contribution to America, and it isn't sitting on a launchpad. Boyle, General Partner at a16z: "I think that Elon's most important contribution to this country is training two generations of engineers … on how to work with their hands again." For a decade, America's sharpest technical minds optimized ad clicks and shipped messaging apps. Software consumed ambition. The physical world became something you abstracted into an API, not something you touched. Building real things became what you did if you couldn't code. Elon didn't reverse that with inspiration. He reversed it by building...