Seaplane and sickle: what they have in common

1. Step 1. Seaplane — has part — Wing. An aeroplane with wings.
2. Step 2. Wing — is part of — Biplane. Two tiers of wings.
3. Step 3. Biplane — includes — Wright Flyer. The Flyer is a biplane.
4. Step 4. Wright Flyer — has part — Roller chain. The propellers were driven from the engine by bicycle chains — the Wrights were bicycle makers.
5. Step 5. Roller chain — is part of — Combine harvester. Chain drives power the working parts.
6. Step 6. Combine harvester — evolved from — Sickle. The machine replaced reaping by hand.

Open Evothings