Online payments and diesel engine: what they have in common

1. Step 1. Online payments — uses — Payment card. Cards.
2. Step 2. Payment card — uses — NFC. Contactless cards.
3. Step 3. NFC — is used in — Continuous glucose monitoring. Glucose sensor data is read with a phone over NFC.
4. Step 4. Continuous glucose monitoring — is used in — Insulin pump. A closed-loop system.
5. Step 5. Insulin pump — has part — Piston. The reservoir’s plunger.
6. Step 6. Piston — is part of — Diesel engine. Pistons move in the cylinders.

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