Most people handle dozens of dollar bills without ever noticing a small, blue five-pointed detail that only some carry. This small star at the end of a U.S. bill's serial number shows that the bill is ...

Most people glance at a $20 bill just long enough to confirm it's real before handing it over or tossing it in a deposit envelope. That's completely understandable. What most people don't realize is ...

I’m not a collector. But Chris Naughton — a building manager in San Antonio — recently showed me a hobby I’m in danger of starting. It’s right up my alley. Naughton caught my attention by telling me ...