Unless you're the handy practical type, you probably don't handle a screw very often. You can think of a screw as a cylindrical rod with a continuous spiral thread on the outside, and which is used ...

Back when hardware meant bony plates and flesh-rending teeth, a living version of the humble screw evolved naturally in, of all places, the leg joints of weevils. The legs of at least 15 kinds of ...

Screws may be commonplace, but that doesn't mean they're simple. A screw is any shaft with a corkscrew groove carved around its surface and, regardless of their design, screws are usually used to ...

Like one of the fastest airplanes that ever flew,† the two-man Japanese submarines which attacked Pearl Harbor had contrarotating propellers —two tandem screws placed close together, turning in ...