Wikipedia and lead–acid battery: what they have in common

1. Step 1. Wikipedia — uses — Wiki. A wiki engine.
2. Step 2. Wiki — uses — World Wide Web. A website.
3. Step 3. World Wide Web — is used in — Search engine. It indexes the web.
4. Step 4. Search engine — uses — Data centre. It runs in data centres.
5. Step 5. Data centre — has part — Uninterruptible power supply. Backup power.
6. Step 6. Uninterruptible power supply — has part — Lead–acid battery. A battery.

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