How Many Light Bulbs Does It Take to Change the World?

Almost every schoolchild learns that Thomas Edison invented the light bulb. But did he? And if he hadn't invented it, would we be still living in the dark? Acclaimed author Matt Ridley (The Rational Optimist, The Evolution of Everything) explains that at least 20 other people can lay claim to this breakthrough moment. Ridley argues that the light bulb emerged from the combined technologies and acc...