President Obama recently suggested the retirement of the penny as a way of reducing the federal budget, since it costs nearly two and a half times its face value to mint. While that may not happen any time soon, it’s still interesting to look at some other coins in U.S. history that were retired, were exceptionally rare, or never even made it off the drawing board...... READ ON

We’ve all found something that we thought might be worth a lot of money. We have not all been fortunate enough to stumble across anything actually worth a fortune. Rob has shared some of these stories before, but here are a few more people who accidentally discovered something incredibly valuable. 1. A 500-Year-Old... READ ON

We've all heard of flash mobs, but what on earth is a cash mob? As it turns out, it's like a flash mob, only it involves a shopping spree designed to help boost a local business. Just like Fight Club, there are some rules about organizing a cash mob, although the Cash Mobs website insists that these are completely optional and can be tweaked. A few notable rules: • The mob date must be announced at least a week in advance via Twitter. • The location at which to meet will be announced, but not... READ ON

TGI Free-for-all Friday! Good luck with today's mentalfloss.com Brain Game. NOTE: Shortly after this puzzle was first published, I had to make adjust the answer (per info provided by the keen mind of reader Richard). If you're seeing this note, the puzzle is correct now. Thanks! Bruce's pocket is full of valid, current U.S. notes and coins (but he has no $100 bills). Still, he cannot make exact change for any U.S. note. What's the largest amount of money Bruce could have? Here is... READ ON