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At no stage mankind may have thought that mice may get so much of importance. Traditionally mice have been hated by mankind. They have been loathed as creatures of destruction. But in the cyber world they have assumed a very important role.In olden days computers were as big as rooms that housed them. They had an amazing array of buttons and sliders. The requirement was to find a device that could point X-Y coordinates accurately. A US radar technician called Douglas Engelbart of the Stanford Research Institute took up the challenge. He invented a pointing device that had a long cable trailing. It helped to do the job of an “X-Y position indicator”.The trailing cable gave it the moniker of mouse. This amazing discovery led to the discovery of the modern day mouse. Today the population of computer mice is about to touch a billion numbers all over the world. They have become a house hold name.The invention of touch screens is making things different. People expect computer mice to be extinct in another decade.