Password and vacuum pump: what they have in common

1. Step 1. Password — is used in — Two-factor authentication. Password + a second factor.
2. Step 2. Two-factor authentication — uses — SMS. Codes by SMS.
3. Step 3. SMS — works like — Electrical telegraph. A short text message is the heir of the telegram.
4. Step 4. Electrical telegraph — has part — Electromagnet. Morse’s receiver.
5. Step 5. Electromagnet — is used in — Mass spectrometer. Deflecting ions with a field.
6. Step 6. Mass spectrometer — has part — Vacuum pump. A vacuum system.

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