On December 9, 1968, Douglas Engelbart invented a pointing device that would change everything.
It was the mouse.
In the time of Engelbart, computers were old, clunky, and had no graphical interface. That is, that you couldn't click the button for what you wanted—you had to type in the right command. Fast forward 40 years, and much has changed. There have been billions of mice sold, and computers are not only capable of a GUI, but of games, movies, and much more.
So what's next? Some say it's the motion controls brought in by the Wii. Maybe it's sensors implanted on our heads. Who knows? Only time will tell.

To celebrate the mouse's 40th birthday, Harry McCracken, writer of
PC World's famous "Techlog" column, has put together a
slideshow of pictures of mice. Enjoy!