(The text on this page may underwhelm you: but the level will soon jump: LSS)
The invention called the typewriter introduced the Shift Key. You generally have 2 of them on your keyboard. They look something like the picture on the left. They are located on the left and right sides of your keyboard.
The other invention, called the Mouse, was invented by Douglas C. Engelbart in 1970. These come in different varieties, but always have at least one button located on them. They are located on your desk, or sometimes on a mouse pad.
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