Worm gear and data centre: what they have in common

1. Step 1. Worm gear — is part of — Outboard motor. An angle gearbox.
2. Step 2. Outboard motor — has part — Propeller. A propeller.
3. Step 3. Propeller — is part of — Submarine. A propeller.
4. Step 4. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.
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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