The drinking straw is a device used for transferring a liquid – usually a drink from one location to another (such as from a cup, to your mouth). The earliest drinking straws were hollow stems of grass, literally made of straw. A thin tube of plastic (such as polypropylene and polystyrene) or other material, straight or with an accordion-like living hinge, it is employed by being held with one end in the mouth and another end in the drink. Muscular action reduces air pressure in the mouth, whereupon atmospheric pressure forces the drink up the straw. The first straws were made by the Sumerians, and used for drinking beer (as to avoid the solid byproducts of fermentation). Argentines and their neighbors use a similar metallic device called bombilla that acts as both a straw and sieve for drinking mate tea. The modern drinking straw was patented in 1888 by Marvin C. Stone.