Car battery and router: what they have in common

1. Step 1. Car battery — is made of — Electrolyte. Sulfuric acid is the electrolyte.
2. Step 2. Electrolyte — is part of — Lithium-ion battery. The electrolyte conducts ions but not electrons.
3. Step 3. Lithium-ion battery — is part of — Smartwatch. Powered by a lithium-ion battery.
4. Step 4. Smartwatch — has part — System on a chip (SoC). Inside is a system on a chip.
5. Step 5. System on a chip (SoC) — is part of — Router. A packet-processing processor.

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