### A good answer might be:

- An on/off switch.

# Advantages of Binary 1: Simple; easy to build

An on/off switch is simple and easy to build. An on/off switch moves two pieces of metal together or moves them apart. A light dimmer must gradually and smoothly change the current that reaches the light. It has more components that an on/off switch and must be carefully assembled. An accurate dimmer (where 25% means exactly 25%) is even harder to build.

The same is true for the tiny devices inside of a silicon chip. On/off switches are relatively easy to fabricate. Easy to build means that the devices are cheap, small, and reliable, and millions of them can be put in a small area.

### QUESTION 4:

Which of the following methods for producing books is simple and easy?

- Each book is individually made by scratching marks onto tablets of wet clay.
- Each book is individually made by copying the characters onto paper with pen and ink.
- Many copies of the book are made by carving flat wooden blocks with the text then printing the text on paper.
- Many copies of the book are made by setting movable type and printing the text on paper.