Before the introduction of word processors and copying machines, offices were far more labor-intensive places because scientists and technology experts had not yet found a way to automate certain jobs of secretaries and clerks. The simple task of typing a letter was demanding because if the typist made a mistake; correcting it was difficult. There were a few innovations provided by practical scientists that addressed this problem. One* was called Liquid Paper, is sometimes referred to as "whiteout." Liquid Paper allowed the secretary to paint over mistakes and, after;painstakingly , realigning the paper in the typewriter, retype corrections. The other was correction paper, which functioned like white carbon paper. When a mistake was made, the typist backed up, inserted correction paper, and retyped the mistake so that the struck letters were white and, therefore, difficult to see. Then the...