Uses for a Headlamp

I needed to use a calculator this evening, and mine was in the office. So I borrowed my wife's calculator, which is a relatively old solar model. (It's a TI-30X Solar, to be precise.) Alas, it wasn't working: the calculator is a little old and our living room is somewhat dimly lit. After a few minutes of frustration I got my little LCD headlamp. With the lamp on and pointed at the calculator, it worked fine and I happily averaged some numbers. Headlamps are handy little things -- no home should be without one.