Discovered independently by German mathematicians August Möbius and Johann Listing in 1858, the Möbius strip is a continuous one-sided surface formed by rotating one end of a rectangular strip 180° and attaching it to the other end. If cut down the center, instead of two new strips, only one long one is produced. Because these strips effectively double surface area, they have practical applications as conveyor belts, continuous-loop recording tapes, and ribbons used in what kinds of machines? Discuss
Source: The Free Dictionary