Wheelchair and router: what they have in common

1. Step 1. Wheelchair — has part — Hub motor. Powered wheelchairs.
2. Step 2. Hub motor — is part of — Mars rover. Hub motors.
3. Step 3. Mars rover — has part — Radioisotope generator. Curiosity’s RTG.
4. Step 4. Radioisotope generator — is part of — Space probe. The Voyagers’ RTGs.
5. Step 5. Space probe — has part — Radio module and antenna. Communication with Earth.
6. Step 6. Radio module and antenna — is part of — Router. A Wi-Fi access point.

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