Microphone and rope: what they have in common

1. Step 1. Microphone — uses — Piezoelectric effect. Piezo microphones turn sound pressure into voltage.
2. Step 2. Piezoelectric effect — is used in — Lighter. Piezo lighters.
3. Step 3. Lighter — evolved from — Fire making. A fire striker.
4. Step 4. Fire making — uses — Bow drill. The bow drill is a way of making fire.
5. Step 5. Bow drill — has part — Rope. The bowstring wraps around the drill.

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