Mailbox body and particle accelerator: what they have in common

1. Step 1. Mailbox body — is part of — Letter box. A steel box.
2. Step 2. Letter box — uses — Postal service. The post.
3. Step 3. Postal service — evolved into — Email. Electronic mail.
4. Step 4. Email — works like — Electrical telegraph. An instant text message over a network — like a telegram.
5. Step 5. Electrical telegraph — has part — Electromagnet. Morse’s receiver.
6. Step 6. Electromagnet — is used in — Particle accelerator. Bending magnets.

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