Recommender system and submarine: what they have in common

1. Step 1. Recommender system — is used in — Video hosting. Recommendations.
2. Step 2. Video hosting — uses — Streaming. Streaming.
3. Step 3. Streaming — uses — Data centre. Servers.
4. Step 4. Data centre — has part — Uninterruptible power supply. Backup power.
5. Step 5. Uninterruptible power supply — has part — Lead–acid battery. A battery.
6. Step 6. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.

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