Statistics and submarine: what they have in common

1. Step 1. Statistics — uses — Hollerith tabulator. Processing censuses.
2. Step 2. Hollerith tabulator — uses — Electromagnetism. The counters click with electromagnets.
3. Step 3. Electromagnetism — is used in — Starter motor. A starter is an electric motor.
4. Step 4. Starter motor — uses — Car battery. Power.
5. Step 5. Car battery — is a kind of — Lead–acid battery. Lead–acid.
6. Step 6. Lead–acid battery — is part of — Submarine. Underwater, electric motors run on batteries.

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