That $1, $5 or $10 bill in your wallet might be worth way more than its face value if it has one of these types of cool serial numbers -- even hundreds or thousands of dollars. Here’s what to look for ...

Although most of your paper money won't be worth more than what it says, there's a chance it might — even if it's not decades old — based on the serial number. To find the value, or find out if your ...

If you need to calculate dates in your spreadsheets, Excel uses its own unique system, which it calls Serial Numbers. Every date (month, day, year) and time (hour, minute, and second) has an ...