Zinc and air conditioner: what they have in common

1. Step 1. Zinc — is material for — Voltaic pile. The pile is discs of zinc.
2. Step 2. Voltaic pile — evolved into — Lead–acid battery. Planté’s battery developed the idea of a chemical current source by making it rechargeable.
3. Step 3. Lead–acid battery — is part of — Uninterruptible power supply. A battery.
4. Step 4. Uninterruptible power supply — is part of — Data centre. Backup power.
5. Step 5. Data centre — has part — Air conditioner. Cooling.

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