Pull any bill out of your wallet. See the dark green numbers on the top-left and top-right corners? Those are serial numbers, and some are more rare than others. If you happen to have paper money with ...

Chances are you haven't spent much time thinking about your Apple device's serial number. Whether you own the benchmark Apple Watch Series 9 or a budget-priced refurbished iPhone, your device's serial ...

The next time you're holding a dollar bill, it might be worth looking further than the big number one - you could get more bang from your buck than you expected. Ordinary low denomination bills are ...