You've probably handled thousands of dollar bills in your life without giving them more than a passing glance. Here's the ...

Each modern U.S. dollar bill is designed to be unique, a feature ensured by a distinctive serial number. This identifier, comprising ten or eleven digits, is not a random sequence. Each letter and ...

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 ...