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 ...

Most people slide $20 bills into an ATM without a second glance, but a tiny symbol on the serial number can quietly turn an ...

Rare coins and bills that haven’t been released to the public are often worth a lot of money thanks to an error or specific mint condition, but what about $2, $50 ...