Pinball and kite: what they have in common

1. Step 1. Pinball — has part — Spring. A plunger.
2. Step 2. Spring — is part of — Shock absorber. The spring carries the car's weight while the damper stops it bouncing.
3. Step 3. Shock absorber — is part of — Landing gear. Shock struts.
4. Step 4. Landing gear — is part of — Aeroplane. Landing gear.
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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