Archimedes’ screw and router: what they have in common

1. Step 1. Archimedes’ screw — has part — Crank. A handle or rotary drive.
2. Step 2. Crank — is part of — Steam locomotive. Connecting rods and cranks carry the piston stroke to the wheels.
3. Step 3. Steam locomotive — is used in — Postal service. Mail trains.
4. Step 4. Postal service — evolved into — Email. Electronic mail.
5. Step 5. Email — uses — ARPANET. It appeared on ARPANET.
6. Step 6. ARPANET — has part — Router. The IMPs were the first routers.

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