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 ...

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 ...

“What we are told about Archimedes is a mix of a few hard facts and many legends,” Sherman Stein of the University of California, Davis notes in his book Archimedes: What Did He Do Besides Cry Eureka?

A silk screw isn’t as stiff as a metal one, and that may be important for putting bones back together. Implanting the silk screws into rats’ hind limbs showed that the material could successfully pin ...

Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? Screwdrivers are among the simplest hand tools and everybody knows how to use one.

When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. In a life-threatening accident, a Maryland teenager fell while building a tree house and wound up ...