Titanium and railway track: what they have in common

1. Step 1. Titanium — is material for — Mars rover. The wheels and parts are aluminium and titanium.
2. Step 2. Mars rover — has part — Hub motor. Hub motors.
3. Step 3. Hub motor — is part of — Electric bicycle. A hub motor or a mid-drive motor.
4. Step 4. Electric bicycle — has part — Roller chain. The chain drive from the pedals remains.
5. Step 5. Roller chain — is part of — Roller coaster. A chain lift.
6. Step 6. Roller coaster — uses — Railway track. Rails.

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