We’ve all had that treasured pair of headphones fail us. One moment we’re jamming out to our favorite song, then, betrayal. The right ear goes out. No wait. It’s back. No, damn, it’s gone. It works ...

A soldering iron should have a feel and a grip that makes it easy to hold in your hand, as if it were a large pen. For electronics, you want a slim, needle-like tip to aid in getting the heat (and ...