Think you know everything about your iPhone’s calculator? Think again! Beyond basic arithmetic, this app harbors some hidden tricks that can make your life easier. Whether you’re a math genius or just ...

The iPhone's calculator app might seem quite basic, but there's a lot more to it than meets the eye. For example, it has a built-in scientific calculator. All you need to do is rotate your iPhone ...

Back in my previous life, I was a finance guy—that’s what my undergraduate degree is in, and that’s how I made my living for many years. Through it all, one particular piece of gear was always at my ...