The dollar bill is one of the most recognized objects in the world, yet many people rarely stop to think about its origins, its secret security features, or the surprisingly intense history behind its creation. From Revolutionary War sabotage to its original mission to...

Take a close look at a modern U.S. dime or quarter. You'll notice its circumference is lined with tiny, parallel ridges. This feature, known as reeding, is so common that most people rarely give it a second thought. Yet, these simple lines are not...