Geiger counter and bicycle: what they have in common

1. Step 1. Geiger counter — uses — Radioactivity. It detects particles.
2. Step 2. Radioactivity — is used in — Radioisotope generator. The decay heat of plutonium.
3. Step 3. Radioisotope generator — is part of — Mars rover. Curiosity’s RTG.
4. Step 4. Mars rover — has part — Hub motor. Hub motors.
5. Step 5. Hub motor — is part of — Electric bicycle. A hub motor or a mid-drive motor.
6. Step 6. Electric bicycle — evolved from — Bicycle. A bicycle with an electric drive.

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