Flying buttress and nuclear reactor: what they have in common

1. Step 1. Flying buttress — is part of — Gothic cathedral. Flying buttresses.
2. Step 2. Gothic cathedral — has part — Window glass. Stained glass.
3. Step 3. Window glass — is part of — Wall mirror. Sheet glass.
4. Step 4. Wall mirror — is made of — Silver. Silvering.
5. Step 5. Silver — is material for — Control rod. Control rods of pressurized water reactors are a silver–indium–cadmium alloy.
6. Step 6. Control rod — is part of — Nuclear reactor. The rods control the power.

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