Breeding blanket and payment card: what they have in common

1. Step 1. Breeding blanket — is part of — Fast breeder reactor. Uranium-238 turns into plutonium.
2. Step 2. Fast breeder reactor — has part — Control rod. Control rods.
3. Step 3. Control rod — is made of — Silver. Control rods of pressurized water reactors are a silver–indium–cadmium alloy.
4. Step 4. Silver — is material for — Coin. Silver coins.
5. Step 5. Coin — evolved into — Paper money. A replacement for metal money.
6. Step 6. Paper money — evolved into — Payment card. The next form of money.

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