Voltaic pile and zip: what they have in common

1. Step 1. Voltaic pile — evolved into — Lead–acid battery. Planté’s battery developed the idea of a chemical current source by making it rechargeable.
2. Step 2. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.
3. Step 3. Submarine — is made of — Leather. It was covered with leather.
4. Step 4. Leather — is material for — Bag. Leather.
5. Step 5. Bag — has part — Zip. A zip.

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