Debate on Mouse vs. Touch Screen

It seems to me that it is impossible to imagine PC without its mouse. Because it is very difficult to work on computer with keyboard only. However, nowadays there is a high-tech called touch-screen which does not need mouse. Touch screen is fast and easy to use. It does not occupy much place on your table. Everything from mobile phones and personal multimedia players to computers now feature touch-screen technology. It takes place of some input devices such as keyboard, mouse, and trackball. You can carry touch screen somewhere and use it wherever you want. On the other hand, you encounter some obstacles with touch screen. For instance, the screen might get dirty because of touching it very often, or you may click another icon by chance. Because icons are close to each other, and smaller than fingers. Mouse is a pointing device that helps you to click icons on desktop. Mouse is not as fast as touch screen, but it is difficult to work on computer only with a keyboard.