Stilts and radio: what they have in common

1. Step 1. Stilts — uses — Lever. An extended support.
2. Step 2. Lever — is used in — Joystick. A lever.
3. Step 3. Joystick — evolved into — Gamepad. A game controller.
4. Step 4. Gamepad — has part — Vibration motor. Vibration.
5. Step 5. Vibration motor — is part of — Pager. Vibrating alert.
6. Step 6. Pager — uses — Radio. Radio reception.

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