From its earliest years, the United States was a nation of tinkerers: men and women who looked at the world around them and were able to create something genuinely new from what they saw. Guided by their innate curiosity, a desire to know how things work, and a belief that anything can be improved, amateurs and professionals from Benjamin Franklin to Thomas Edison came up with the inventions that laid the foundations for America's economic dominance. Recently, Americans have come to question whether our tinkering spirit has survived the pressures of ruthless corporate organization and...