Local anaesthesia and heron’s aeolipile: what they have in common

1. Step 1. Local anaesthesia — uses — Syringe. Injections.
2. Step 2. Syringe — is part of — IV drip. A needle.
3. Step 3. IV drip — uses — Gravity flow. The solution flows under gravity.
4. Step 4. Gravity flow — is used in — Water wheel. Falling or flowing water turns the wheel.
5. Step 5. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.
6. Step 6. Turbine — evolved from — Heron’s aeolipile. The aeolipile is the oldest ancestor of the steam turbine.

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