Gold and steam turbine: what they have in common

1. Step 1. Gold — is material for — Rapid test. The label is gold nanoparticles.
2. Step 2. Rapid test — is made of — Cellulose. The strip is nitrocellulose.
3. Step 3. Cellulose — is material for — Smokeless powder. Nitrocellulose.
4. Step 4. Smokeless powder — is material for — Solid rocket motor. The propellant is smokeless powder.
5. Step 5. Solid rocket motor — has part — De Laval nozzle. A nozzle.
6. Step 6. De Laval nozzle — evolved from — Steam turbine. De Laval invented the nozzle for a steam turbine.

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