SMTP and piston pump: what they have in common

1. Step 1. SMTP — is used in — Email. Sending mail.
2. Step 2. Email — evolved from — Postal service. Electronic mail.
3. Step 3. Postal service — uses — Steam locomotive. Mail trains.
4. Step 4. Steam locomotive — has part — Watt steam engine. A steam locomotive is driven by a steam engine.
5. Step 5. Watt steam engine — evolved from — Piston pump. The first steam engines (Newcomen’s) pumped water out of mines by driving pumps.

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