Mower blades themselves aren't threaded, but rather the fastener that holds the blade in place can be either right or left-threaded. Right-hand threaded fasteners tighten clockwise and loosen ...

Doors can swing one of two ways—to the right or to the left—and this is very important when you’re remodeling. Door swing directionality is called door handing, and it isn’t all that obvious, ...

The short answer is because most people are right-handed. When the first chain-driven bicycles were designed, around the year 1890, the easiest way to attach the sprocket for the chain on the rear ...