What is currency, exactly? We all know currency is a piece of paper or metal you can trade for stuff you need or want, but who decides what your money is worth? And why does its value fluctuate?
You can trade your dollars in for gold bullion from Fort Knox whenever you want -- right? Maybe not. See more »
Humans have assigned value to all kinds of things through the ages, from stones to spices. There’s even money made for potential encounters with alien life. How much is the intergalactic value of a Space Quid? The answer may surprise you! See more »
Learn why Lincoln and Jefferson don't face left like all the other presidents on U.S. coins. See more »