Lunar module and lathe: what they have in common

1. Step 1. Lunar module — has part — Landing gear. Legs.
2. Step 2. Landing gear — is part of — Aeroplane. Landing gear.
3. Step 3. Aeroplane — evolved from — Glider. The Wrights added an engine to a glider.
4. Step 4. Glider — evolved from — Kite. Lilienthal and Cayley studied the wing with kites and gliders.
5. Step 5. Kite — has part — Rope. The line holds the kite and passes the tension to the hand.
6. Step 6. Rope — is part of — Lathe. The bowstring wraps around the workpiece and turns it.

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