Let’s be honest. You’ve probably never really thought about a screwdriver. It just sits in your drawer – maybe a little rusty, maybe with a chipped handle. But the story of this simple piece of metal is surprisingly dramatic. It involves medieval castles, ambitious millionaires, industrial espionage, and even life-saving technologies. One Tool, 500 Years, 4 Revolutions: […] Post From Knight’s Armor to Smart Plastics: 500 Years of Progress Behind a Simple Screw at Root-Nation.com.