Bicycle drivetrain and data centre: what they have in common

1. Step 1. Bicycle drivetrain — has part — Crank. The cranks turn the motion of the legs into rotation.
2. Step 2. Crank — evolved into — Starter motor. It replaced the starting crank.
3. Step 3. Starter motor — uses — Car battery. Power.
4. Step 4. Car battery — is a kind of — Lead–acid battery. Lead–acid.
5. Step 5. Lead–acid battery — is part of — Uninterruptible power supply. A battery.
6. Step 6. Uninterruptible power supply — is part of — Data centre. Backup power.

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