In 1994, a revolutionary ergonomic mouse was invented and patented by Jack Lo due to discomfort he had when using a conventional mouse. His invention was the first mouse to support a hand in a fully upright handshake position for eliminating the arm twisting required by ordinary mice. Evoluent also developed the no number pad on the keyboard which lets the mouse get closer. The numeric keys on the right side of a full size keyboard makes the mouse sit too far away and your right arm too extended. Eliminating the right side numeric keys not only saves space, your mouse can get closer so your arm is more relaxed.