Seaplane floats and piston pump: what they have in common

1. Step 1. Seaplane floats — is part of — Seaplane. They keep the plane on the water and serve as skis for the takeoff run.
2. Step 2. Seaplane — uses — Archimedes’ principle. Floats.
3. Step 3. Archimedes’ principle — is used in — Diving bell. Sinking with ballast.
4. Step 4. Diving bell — evolved into — Diving suit. Individual equipment.
5. Step 5. Diving suit — has part — Piston pump. Air was pumped from the surface.

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