Control rod and kite: what they have in common

1. Step 1. Control rod — is part of — Nuclear reactor. The rods control the power.
2. Step 2. Nuclear reactor — is part of — Nuclear icebreaker. A reactor plant.
3. Step 3. Nuclear icebreaker — has part — Propeller. Propellers.
4. Step 4. Propeller — is part of — Aeroplane. Propeller aircraft.
5. Step 5. Aeroplane — evolved from — Glider. The Wrights added an engine to a glider.
6. Step 6. Glider — evolved from — Kite. Lilienthal and Cayley studied the wing with kites and gliders.

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