Walkie-talkie and plumbing: what they have in common

1. Step 1. Walkie-talkie — evolved into — Mobile phone. Portable radio communication.
2. Step 2. Mobile phone — has part — Keyboard. A numeric keypad.
3. Step 3. Keyboard — is part of — Linotype. A keyboard.
4. Step 4. Linotype — evolved from — Movable type. Mechanized typesetting.
5. Step 5. Movable type — is made of — Clay. Bi Sheng’s type was made of fired clay.
6. Step 6. Clay — is material for — Plumbing. Minoan plumbing used ceramic pipes.

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