Chemical plant and headphones: what they have in common

1. Step 1. Chemical plant — uses — Sulfuric acid. The first chemical plants produced sulfuric acid and soda.
2. Step 2. Sulfuric acid — is used in — Lead–acid battery. The electrolyte.
3. Step 3. Lead–acid battery — evolved into — Lithium-ion battery. The lithium-ion battery is the next generation of rechargeable chemical current sources, with higher specific energy.
4. Step 4. Lithium-ion battery — is part of — Wireless earbuds. A battery.
5. Step 5. Wireless earbuds — evolved from — Headphones. Wireless headphones.

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