Rocket fins and submarine: what they have in common

1. Step 1. Rocket fins — is part of — Rocket. Tail feathers or a stick keep the rocket on course.
2. Step 2. Rocket — has part — De Laval nozzle. A narrowing at the outlet accelerates the gases and increases thrust.
3. Step 3. De Laval nozzle — evolved from — Steam turbine. De Laval invented the nozzle for a steam turbine.
4. Step 4. Steam turbine — is part of — Nuclear submarine. A turbine turns the propeller.
5. Step 5. Nuclear submarine — evolved from — Submarine. Nuclear power let submarines stay submerged for months.

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