A fountain pen is a pen that contains a reservoir of water-based liquid ink. The ink is fed to the nib through a "feed" via a combination of gravity and capillary action. Filling the fountain pen reservoir with ink involves replacing a disposabl

Background
Humans have used various instruments to convey thoughts and feelings. Man's first writing instrument was his finger, using it to form symbols in the dirt. Later, pieces of metal or bone were used. Ancient Greeks used a stylus to mark on wax

A stapler is a tool that combines together sheets of paper or other materials by driving a thin metal staple through the sheets and folding over the ends to secure the paper. It is commonly found in offices, schools, or other places that process large amo

Background
There are virtually as many types of staplers as there are uses for them. Staplers are produced for use in: the manufacture of furniture; medical fields; carpet tacking; electrical wire and insulation installation; picture frame manufacture and

An envelope is a packaging product, usually made of flat, planar material such as paper or cardboard, and designed to contain a flat object, which in a postal-service context is usually a letter or card. The traditional type is made from a sheet of paper

Origin: 1988
Long before 1988, in the early years after World War II, push the envelope was on the cutting edge (1951) of aviation. It referred to the envelope, or limit of performance for an aircraft, and test pilots like Chuck Yeager who had "the r

Background
An envelope is a flat, flexible container, made of paper or similar material, that has a single opening and a flap that can be sealed over the opening. The envelope is usually sealed by wetting an area of the flap. Some envelopes are sealed wit

A pencil sharpener (also referred to as pencil parer) is a device for sharpening a pencil's point by shaving one end. Pencil sharpeners exist in both electric and hand-powered forms.