The difference is between implementation/engineering, which is what most software companies are doing, and invention/science, which is what Theranos is trying t

The difference is between implementation/engineering, which is what most software companies are doing, and invention/science, which is what Theranos is trying to do. It's OK not to build something before selling it if you know that it's possible to make it, but just haven't done it yet because it would take time/money you don't have. It's not OK if you don't even know if it's possible.