Imagine a program that turns a relatively small initial investment into billions of dollars of U.S. economic growth, thousands of new Americans jobs, and groundbreaking technologies that change the way we use energy in this country and around the world. It would be a darling of innovators, the private sector, and policymakers. Sounds impossible for such a little program to generate such big results? Just like the little engine in the children's story that pulled the train over the mountain, the U.S. has a small venture that could generate big results. It's called the Advanced Research Projects Agency - Energy, …