Helium and bicycle: what they have in common

1. Step 1. Helium — is used in — Blimp. Helium.
2. Step 2. Blimp — has part — Tail fins and rudder. Rudder and elevators.
3. Step 3. Tail fins and rudder — is part of — Biplane. A tailplane and control surfaces.
4. Step 4. Biplane — includes — Wright Flyer. The Flyer is a biplane.
5. Step 5. Wright Flyer — was inspired by — Bicycle. The experience of the Wrights’ bicycle shop — chains, light structures, the idea of controlled instability.

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