Coin and CNC machine: what they have in common

1. Step 1. Coin — is made of — Gold. The first Lydian coins were made of electrum, an alloy of gold and silver.
2. Step 2. Gold — is material for — Glucose meter. The strip electrodes are gold or carbon.
3. Step 3. Glucose meter — evolved into — Continuous glucose monitoring. Continuous measurement.
4. Step 4. Continuous glucose monitoring — is used in — Insulin pump. A closed-loop system.
5. Step 5. Insulin pump — has part — Servomotor. A stepper motor moves the plunger.
6. Step 6. Servomotor — is part of — CNC machine. Servo drives move the axes.

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