Axe and sonar: what they have in common

1. Step 1. Axe — evolved from — Hand axe. A hand axe mounted on a handle.
2. Step 2. Hand axe — is made of — Flint. Hand axes were flaked from flint on both sides.
3. Step 3. Flint — is material for — Flintlock. A flint strikes the spark.
4. Step 4. Flintlock — works like — Lighter. The same way of striking a spark.
5. Step 5. Lighter — uses — Piezoelectric effect. Piezo lighters.
6. Step 6. Piezoelectric effect — is used in — Sonar. Langevin’s transducer is piezoelectric quartz.

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