Launch complex and payment card: what they have in common

1. Step 1. Launch complex — uses — Rocket. Launching rockets.
2. Step 2. Rocket — uses — Reaction force. A rocket moves by reaction force.
3. Step 3. Reaction force — is used in — Heron’s aeolipile. Jets of steam spin the ball by reaction force.
4. Step 4. Heron’s aeolipile — inspired — Vending machine. Heron described both a holy-water dispenser and the aeolipile; the dispenser is the prototype of the vending machine.
5. Step 5. Vending machine — includes — ATM. A dispensing machine.
6. Step 6. ATM — uses — Payment card. It dispenses money for a card.

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