If you run into any issues with your new MagSafe Battery Pack, you may need to provide Apple Support with its serial number. There are a couple of quick and easy ways to find that. We’ll show you how.

Most electronics come with a bevy of numbers etched into their frames, stamped on their undersides, and emblazoned onto their boxes. But why? Well, the short answer is that they're needed for model ...

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 ...