Intercom and gutenberg printing press: what they have in common

1. Step 1. Intercom — has part — Microphone. A microphone.
2. Step 2. Microphone — uses — Piezoelectric effect. Piezo microphones turn sound pressure into voltage.
3. Step 3. Piezoelectric effect — is used in — Inkjet printer. Piezo heads eject droplets.
4. Step 4. Inkjet printer — uses — Ink. Ink.
5. Step 5. Ink — is used in — Gutenberg printing press. An impression needs ink; Gutenberg used an oil-based one.

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