Ultrasound and heron’s aeolipile: what they have in common

1. Step 1. Ultrasound — is used in — Sonar. Ultrasonic pulses.
2. Step 2. Sonar — is part of — Destroyer. Underwater acoustics.
3. Step 3. Destroyer — has part — Steam turbine. Turbines.
4. Step 4. Steam turbine — is a kind of — Turbine. A kind of turbine.
5. Step 5. Turbine — evolved from — Heron’s aeolipile. The aeolipile is the oldest ancestor of the steam turbine.

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