Mop and voltaic pile: what they have in common

1. Step 1. Mop — is made of — Cotton. A mop is cotton strands.
2. Step 2. Cotton — is material for — Vacuum cleaner. The dust bag is a cloth bag.
3. Step 3. Vacuum cleaner — evolved into — Robot vacuum. An autonomous vacuum cleaner.
4. Step 4. Robot vacuum — has part — Lithium-ion battery. A battery.
5. Step 5. Lithium-ion battery — evolved from — Lead–acid battery. The lithium-ion battery is the next generation of rechargeable chemical current sources, with higher specific energy.
6. Step 6. Lead–acid battery — evolved from — Voltaic pile. Planté’s battery developed the idea of a chemical current source by making it rechargeable.

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