SMTP and vacuum pump: what they have in common

1. Step 1. SMTP — is used in — Email. Sending mail.
2. Step 2. Email — works like — Electrical telegraph. An instant text message over a network — like a telegram.
3. Step 3. Electrical telegraph — has part — Electromagnet. Morse’s receiver.
4. Step 4. Electromagnet — is used in — Mass spectrometer. Deflecting ions with a field.
5. Step 5. Mass spectrometer — has part — Vacuum pump. A vacuum system.

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