Document scanner bar and nuclear reactor: what they have in common

1. Step 1. Document scanner bar — is part of — Fax. It reads the sheet line by line.
2. Step 2. Fax — uses — Electrochemical reaction. The paper darkened under current.
3. Step 3. Electrochemical reaction — is used in — Lead–acid battery. A reversible reaction of lead and lead dioxide in sulfuric acid.
4. Step 4. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.
5. Step 5. Submarine — evolved into — Nuclear submarine. Nuclear power let submarines stay submerged for months.
6. Step 6. Nuclear submarine — has part — Nuclear reactor. A reactor.

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