MegaPenny

The MegaPenny Project: "Visualizing huge numbers can be very difficult. People regularly talk about millions of miles, billions of bytes, or trillions of dollars, yet it's still hard to grasp just how much a 'billion' really is. The MegaPenny Project aims to help by taking one small everyday item, the U.S. penny, and building on that to answer the question: 'What would a billion (or a trillion) pennies look like?'"