Liquid sodium coolant and camera: what they have in common

1. Step 1. Liquid sodium coolant — is part of — Fast breeder reactor. Liquid sodium carries away the heat.
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 — Silver halide. A silver salt.
5. Step 5. Silver halide — is used in — Daguerreotype. A silvered plate with silver iodide.
6. Step 6. Daguerreotype — is used in — Camera. The first cameras were daguerreotype cameras.

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