The KeyMouse\u2122 is a keyboard and a mouse. It allows users to operate the mouse without moving their hands out of typing position. No more moving your hand back and forth between the keyboard and mouse.
Computer Hardware: Building a Computer. Plans and resources for a project to build understanding of computer specifications by learning to build your own computer system: looks at what's inside the case, peripheral devices and operating systems. Aimed at KS3 but could adapt for KS2. (from TES).