The first modern computer mouse was made of what?

The mouse's key feature is its trackball. The first known trackball can be traced to the Canadian Navy in 1952. This "mouse" was actually a bowling ball attached to a complicated hardware system that could sense the motion of the ball and imitate the movement on a screen. But the world would never have access to the heavy-duty mouse — since it was a secret military creation, the tech was never patented or produced.

Eleven years after the military design, Douglas Engelbart became the father of the modern mouse. He developed a gadget made with a wooden base using two wheels to roll back and forth. It was the first mouse that could fit into a user's hand.