Rivet and internet: what they have in common

1. Step 1. Rivet — is part of — Eiffel Tower. 2.5 million rivets.
2. Step 2. Eiffel Tower — is made of — Wrought iron. Puddled iron.
3. Step 3. Wrought iron — is material for — Steam locomotive. The boiler is wrought iron.
4. Step 4. Steam locomotive — is used in — Postal service. Mail trains.
5. Step 5. Postal service — evolved into — Email. Electronic mail.
6. Step 6. Email — uses — Internet. It works over the Internet.

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